MedWorm.com provides a medical RSS filtering service. Over 6000 RSS medical sources are combined and output via different filters. This feed contains the latest items from the 'Optics Express' source. Mon, 06 Feb 2012 20:25:00 +0100 http://www.medworm.com/index.php?rid=5664509&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4248 We report on a diode-pumped Yb:KGW (ytterbium-doped potassium gadolinium tungstate) laser with a repetition rate of 4.8 GHz and a pulse duration of 396 fs. Stable fundamental modelocking is achieved with a semiconductor saturable absorber mirror (SESAM). The average output power of this compact ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5664509 Tue, 07 Feb 2012 01:06:11 +0100 5664509 http://www.medworm.com/index.php?rid=5664517&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4219 A hybrid CATV/OFDM long-reach PON architecture is proposed and experimentally demonstrated. By multiplexing the OFDM and CATV signals in different frequency bands, the overall network structure is simplified and the available bandwidth for the OFDM signals is increased. Furthermore, by carefully ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5664517 Mon, 06 Feb 2012 05:00:00 +0100 5664517 http://www.medworm.com/index.php?rid=5664516&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4213 We report the fabrication of a waveguide structure in a near-stoichiometric lithium niobate crystal using 200-MeV argon-ion irradiation at a fluence of 2 × 10^12 ions/cm^2. Guided modes were detected in the visible and near-infrared wavelength regions, suggesting that the waveguide can be ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5664516 Mon, 06 Feb 2012 05:00:00 +0100 5664516 http://www.medworm.com/index.php?rid=5664515&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4206 We report on GaAs-based high power density vertical-cavity surface-emitting laser diodes (VCSELs) with ion implanted isolated current apertures. A continuous-wave output power of over 380 mW and the power density of 4.9 kW/cm^2 have been achieved at 15 °C from the 100-μm-diameter ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5664515 Mon, 06 Feb 2012 05:00:00 +0100 5664515 http://www.medworm.com/index.php?rid=5664514&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4198 The nonlinear transmission performance of quasi-Nyquist wavelength-division multiplexing (qN-WDM) and reduced guard interval orthogonal frequency-division multiplexing (RGI-OFDM) using polarization-division multiplexing quadrature phase-shift-keying (PDM-QPSK) and quadrature amplitude modulation ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5664514 Mon, 06 Feb 2012 05:00:00 +0100 5664514 http://www.medworm.com/index.php?rid=5664513&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4189 We propose and demonstrate a novel electrical tracing-assisted dual-microring resonator-based optical sensor system in silicon-on-insulator substrate. The system comprises one microring resonator-based sensing element and another microring resonator-based tracing element integrated with electrical ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5664513 Mon, 06 Feb 2012 05:00:00 +0100 5664513 http://www.medworm.com/index.php?rid=5664512&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4232 By use of the generalized von Kármán spectrum model that features both inner scale and outer scale parameters for non-Kolmogorov turbulence and the extended Rytov method that incorporates a modified amplitude spatial-frequency filter function under strong-fluctuation conditions, ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5664512 Mon, 06 Feb 2012 05:00:00 +0100 5664512 http://www.medworm.com/index.php?rid=5664511&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4260 In this work we propose a unique sampling scheme of Radon Projections and a non-linear reconstruction algorithm based on compressive sensing (CS) theory to implement a progressive compressive sampling imaging system. The progressive sampling scheme offers online control of the tradeoff between the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5664511 Mon, 06 Feb 2012 05:00:00 +0100 5664511 http://www.medworm.com/index.php?rid=5664510&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4254 Liquid crystalline molecules carrying photopolymerizable end groups absorb photon energy via a two-photon process, enabling the photofabrication of 3D structures. In this work, we prepared microgears with different heights and tooth lengths. These birefringent microgears can be induced to rotate by ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5664510 Mon, 06 Feb 2012 05:00:00 +0100 5664510 http://www.medworm.com/index.php?rid=5656932&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4176 We study the effect of nonlocal optical response on the optical properties of metallic nanowires, by numerically implementing the hydrodynamical Drude model for arbitrary nanowire geometries. We first demonstrate the accuracy of our frequency-domain finite-element implementation by benchmarking it ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656932 Fri, 03 Feb 2012 05:00:00 +0100 5656932 http://www.medworm.com/index.php?rid=5656931&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4168 The proof-of-concept of an infrared imaging tip by an array of infrared waveguides tapered as small as 2 μm is demonstrated. The fabrication is based on a high-pressure chemical fluid deposition technique to deposit precisely defined periodic arrays of Ge and Si waveguides within a ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656931 Fri, 03 Feb 2012 05:00:00 +0100 5656931 http://www.medworm.com/index.php?rid=5656930&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4159 Monitoring (currently invasive) of cerebral venous blood oxygenation is a key to avoiding hypoxia-induced brain injury resulting in death or severe disability. Noninvasive, optoacoustic monitoring of cerebral venous blood oxygenation can potentially replace existing invasive methods. To the best of ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656930 Fri, 03 Feb 2012 05:00:00 +0100 5656930 http://www.medworm.com/index.php?rid=5656929&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4149 We describe femtosecond X-ray diffraction data sets of viruses and nanoparticles collected at the Linac Coherent Light Source. The data establish the first large benchmark data sets for coherent diffraction methods freely available to the public, to bolster the development of algorithms that are ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656929 Fri, 03 Feb 2012 05:00:00 +0100 5656929 http://www.medworm.com/index.php?rid=5656928&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4136 We present the first full gain characterization of two vertical external cavity surface emitting laser (VECSEL) gain chips with similar designs operating in the 960-nm wavelength regime. We optically pump the structures with continuous-wave (cw) 808-nm radiation and measure the nonlinear ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656928 Fri, 03 Feb 2012 05:00:00 +0100 5656928 http://www.medworm.com/index.php?rid=5656927&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4124 We study the near-field probing of the slow Bloch laser mode of a photonic crystal by a bowtie nano-aperture (BNA) positioned at the end of a metal-coated fiber probe. We show that the BNA acts as a polarizing nanoprobe allowing us to extract information about the polarization of the near-field of ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656927 Fri, 03 Feb 2012 05:00:00 +0100 5656927 http://www.medworm.com/index.php?rid=5656926&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4114 We report the validation of the Diagonal Scan (D-Scan) technique to determine the incubation parameter for ultrashort laser pulses ablation. A theory to calculate the laser pulses superposition and a procedure for quantifying incubation effects are described, and the results obtained for BK7 ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656926 Fri, 03 Feb 2012 05:00:00 +0100 5656926 http://www.medworm.com/index.php?rid=5656925&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4102 Coherent pulse interleaving implemented in planar waveguide technology is presented as a compact and robust solution to generate high repetition rate frequency combs. We demonstrate a 10 GHz pulse train from an Er-doped femtosecond fiber laser that is coupled into waveguide interleavers and ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656925 Fri, 03 Feb 2012 05:00:00 +0100 5656925 http://www.medworm.com/index.php?rid=5656946&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4085 Results of a self-consistent ultrafast study of nonlinear optical properties of silicon nanowaveguides using heterodyne pump-probe technique are reported. The two-photon absorption coefficient and free-carrier absorption effective cross-section were determined to be 0.68cm/GW, and 1.9x10^−17 ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656946 Thu, 02 Feb 2012 05:00:00 +0100 5656946 http://www.medworm.com/index.php?rid=5656945&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4074 We propose and demonstrate the use of a wavefront analyzer based on lateral shearing interferometry to characterize the modal content of multimode fibers. This wavefront measurement technique is applied to large mode area fibers, and allows us to recover both the intensity and relative phase of ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656945 Thu, 02 Feb 2012 05:00:00 +0100 5656945 http://www.medworm.com/index.php?rid=5656944&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4067 Emission of terahertz radiation is observed when surface plasmons are excited on a thin film of gold, in the Kretschmann geometry. When a hemicyanine-terminated alkanethiol self-assembled monolayer of thickness 1.2 nm is deposited on the gold film, stronger terahertz emission is observed. Our ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656944 Thu, 02 Feb 2012 05:00:00 +0100 5656944 http://www.medworm.com/index.php?rid=5656943&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4056 We fabricated surface nanostructures with different pillar and cone shapes on glass substrates using thermally dewetted gold (Au) nanoparticles as etch masks by dry etching. Their optical total transmittance characteristics, together with theoretical predictions using rigorous coupled-wave analysis ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656943 Thu, 02 Feb 2012 05:00:00 +0100 5656943 http://www.medworm.com/index.php?rid=5656942&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4050 We implemented the linear programming approach proposed by Oliker and by Wang to solve the single reflector problem for a point source and a far-field target. The algorithm was shown to produce solutions that aim the input rays at the intersections between neighboring reflectors. This feature makes ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656942 Thu, 02 Feb 2012 05:00:00 +0100 5656942 http://www.medworm.com/index.php?rid=5656941&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4039 A coherent x-ray diffraction experiment was performed on an isolated colloidal crystal grain at the coherence beamline P10 at PETRA III. Using azimuthal rotation scans the three-dimensional (3D) scattered intensity from the sample in the far-field was measured. It includes several Bragg peaks as ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656941 Thu, 02 Feb 2012 05:00:00 +0100 5656941 http://www.medworm.com/index.php?rid=5656940&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4032 An electric field sensor based on the indirect bonding of submicrometer thin films of lithium niobate to silicon microring resonators is presented using benzocyclobutene as an intermediate bonding layer. The hybrid material system combines the electro-optic functionality of lithium niobate with the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656940 Thu, 02 Feb 2012 05:00:00 +0100 5656940 http://www.medworm.com/index.php?rid=5656939&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4024 A single-layer resonant-waveguide grating consisting of a sub-wavelength grating coupler etched into a waveguide is proposed in order to achieve high polarization and high spectral selectivity inside an Yb:YAG thin-disk laser resonator. The designed structure was fabricated with the help of a ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656939 Thu, 02 Feb 2012 05:00:00 +0100 5656939 http://www.medworm.com/index.php?rid=5656938&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4018 We report the generation of a real-time large computer generated hologram (CGH) using the wavefront recording plane (WRP) method with the aid of a graphics processing unit (GPU). The WRP method consists of two steps: the first step calculates a complex amplitude on a WRP that is placed between a 3D ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656938 Thu, 02 Feb 2012 05:00:00 +0100 5656938 http://www.medworm.com/index.php?rid=5656937&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-4009 In this paper the analytic models (AMs) of the spectral responses of fiber-grating-based interferometers are derived from the Fourier mode coupling (FMC) theory proposed recently. The interferometers include Fabry-Perot cavity, Mach-Zehnder and Michelson interferometers, which are constructed by ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656937 Thu, 02 Feb 2012 05:00:00 +0100 5656937 http://www.medworm.com/index.php?rid=5656936&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3997 Thermally induced waveguide changes become significant for very large mode area fibers. This results in a reduction of the mode-field diameter, but simultaneously in an improvement of the beam quality. In this work the first systematic experimental characterization of the reduction of the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656936 Thu, 02 Feb 2012 05:00:00 +0100 5656936 http://www.medworm.com/index.php?rid=5656935&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3990 A new diagnostic approach for assessing the in-depth laser induced modifications upon ultraviolet polymer irradiation is presented. The methodology relies on the observation of morphological alterations in the bulk material (Paraloid B72) by using third harmonic generation. This non destructive ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656935 Thu, 02 Feb 2012 05:00:00 +0100 5656935 http://www.medworm.com/index.php?rid=5656934&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3983 Room-temperature pulsed operation of a 1.3-µm wavelength transistor laser (TL), consisting of a buried heterostructure (BH) with an npn configuration and an AlGaInAs/InP multiple-quantum-well (MQW) active region, was successfully attained. A threshold base current of 18 mA (threshold emitter ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656934 Thu, 02 Feb 2012 05:00:00 +0100 5656934 http://www.medworm.com/index.php?rid=5656933&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3975 Despite the extensive use of polycapillary x-ray optics for focusing and collimating applications, there remains a significant need for characterization of the coherence properties of the output wavefield. In this work, we present the first quantitative computational method for calculation of the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656933 Thu, 02 Feb 2012 05:00:00 +0100 5656933 http://www.medworm.com/index.php?rid=5656965&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3967 We describe the spatial coherence properties of a cold atom electron source in the framework of a quasihomogeneous wavefield. The model is used as the basis for direct measurements of the transverse spatial coherence length of electron bunches extracted from a cold atom electron source. The ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656965 Wed, 01 Feb 2012 05:00:00 +0100 5656965 http://www.medworm.com/index.php?rid=5656964&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3954 We found that the distances between isolated scatterers with similar columnar shapes could be measured by taking a single Fourier transform of their diffraction intensity. If the scatterers have different shapes, the distances between similar shapes can be selected from the distances between all ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656964 Wed, 01 Feb 2012 05:00:00 +0100 5656964 http://www.medworm.com/index.php?rid=5656963&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3948 We study Čerenkov-type second-harmonic generation in a two-dimensional quasi-periodically poled LiNbO_3 crystal. We employ a new geometry of interaction to observe simultaneous emission of multi-directional nonlinear Čerenkov radiation with comparable intensities. This opens a way to ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656963 Wed, 01 Feb 2012 05:00:00 +0100 5656963 http://www.medworm.com/index.php?rid=5656962&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3941 Low threshold and widely tunable InAs/GaAs quantum-dot lasers are implemented with grating-coupled external-cavity arrangement. Throughout the tuning range of 130 nm, from 1160 to 1290 nm, the threshold current density is not more than 0.9 kA/cm^2 and no noticeable threshold jump is observed. For a ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656962 Wed, 01 Feb 2012 05:00:00 +0100 5656962 http://www.medworm.com/index.php?rid=5656961&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3932 Excitation power and temperature dependences of the photoluminescence (PL) spectra are studied in InGaN/GaN multiple quantum wells (MQWs). The excitation power dependences of the PL peak energy and linewidth indicate that the emission process of the MQWs is dominated first by the Coulomb screening ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656961 Wed, 01 Feb 2012 05:00:00 +0100 5656961 http://www.medworm.com/index.php?rid=5656960&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3918 Eye accommodation is considered to function properly for three-dimensional (3D) images generated by holography. We developed a horizontally scanning holographic display technique that enlarges both the screen size and viewing zone angle. A 3D image generated by this technique can be easily seen by ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656960 Wed, 01 Feb 2012 05:00:00 +0100 5656960 http://www.medworm.com/index.php?rid=5656959&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3898 It is shown by analytical calculation based on the tight-binding approximation that the isotropic Dirac cone in the Brillouin zone center can be created in two- and three-dimensional periodic metamaterials by accidental degeneracy of two modes. In the case of two dimensions, the combination of a ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656959 Wed, 01 Feb 2012 05:00:00 +0100 5656959 http://www.medworm.com/index.php?rid=5656958&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3890 We report the fabrication of single mode quantum cascade lasers using a shallow-etched distributed Bragg reflector as frequency selective element. Quasi-continuous single mode tuning over 15 cm^−1 at room temperature and 25 cm^−1 via temperature tuning at Peltier temperatures is ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656958 Wed, 01 Feb 2012 05:00:00 +0100 5656958 http://www.medworm.com/index.php?rid=5656957&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3883 A monitoring technique using the equivalent optical admittance loci of thin films to control the deposition is presented. Real-time broadband spectrum measurements are employed to extract the real-time thin film refraction index and thickness, and the corresponding equivalent optical admittance is ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656957 Wed, 01 Feb 2012 05:00:00 +0100 5656957 http://www.medworm.com/index.php?rid=5656956&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3877 We performed long-haul WDM transmission experiments to compare 10 Gbit/s MSK and QPSK modulation with a channel grid of 12.5 GHz. A standard link setup with inline dispersion compensation was applied in combination with coherent detection and following offline signal processing. Both modulation ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656956 Wed, 01 Feb 2012 05:00:00 +0100 5656956 http://www.medworm.com/index.php?rid=5656955&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3866 A new temperature performance record of 199.5 K for terahertz quantum cascade lasers is achieved by optimizing the lasing transition oscillator strength of the resonant phonon based three-well design. The optimum oscillator strength of 0.58 was found to be larger than that of the previous record ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656955 Wed, 01 Feb 2012 05:00:00 +0100 5656955 http://www.medworm.com/index.php?rid=5656954&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3853 We propose a new method using coherent diffractive imaging for optical color-image encryption and synthesis in the Fresnel domain. An optical multiple-random-phase-mask encryption system is applied, and a strategy based on lateral translations of a phase-only mask is employed during image ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656954 Wed, 01 Feb 2012 05:00:00 +0100 5656954 http://www.medworm.com/index.php?rid=5656953&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3844 We investigate the scaling properties of mode-locked all-normal dispersion fiber oscillators in terms of output pulse energy and compressed pulse duration. Experimental results are achieved by stepwise variation of the resonator dispersion, total fiber length, and the spectral filter bandwidth. ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656953 Wed, 01 Feb 2012 05:00:00 +0100 5656953 http://www.medworm.com/index.php?rid=5656952&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3832 A depressed cladding waveguide with record low loss of 0.12 dB/cm is inscribed in YAG:Nd(0.3at.%) crystal by femtosecond laser pulses with an elliptical beam waist. The waveguide is formed by a set of parallel tracks which constitute the depressed cladding. It is a key element for compact and ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656952 Wed, 01 Feb 2012 05:00:00 +0100 5656952 http://www.medworm.com/index.php?rid=5656951&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3825 We present a hybrid integrated photonic circuit on a silicon-on-insulator substrate that performs ultra high-speed all-optical wavelength conversion. The chip incorporates a 1.25 mm non-linear SOA mounted on the SOI board using gold-tin bumps as small as 14 μm. Τhe device performs chirp ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656951 Wed, 01 Feb 2012 05:00:00 +0100 5656951 http://www.medworm.com/index.php?rid=5656950&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3814 Heavily doped n-type Ge and GeSn are investigated as plasmonic conductors for integration with undoped dielectrics of Si, SiGe, Ge, and GeSn in order to create a foundry-based group IV plasmonics technology. N-type Ge_1-xSnx with compositions of 0 ≤ x ≤ 0.115 are investigated ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656950 Wed, 01 Feb 2012 05:00:00 +0100 5656950 http://www.medworm.com/index.php?rid=5656949&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3803 Praseodymium(Pr^3+)-doped fluorotellurite glasses were synthesized and broadband photoluminescence (PL) covering a wavelength range from 1.30 to 1.67 μm was observed under both 488 and 590 nm wavelength excitations. The broadband PL emission is mainly due to the radiative transition from the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656949 Wed, 01 Feb 2012 05:00:00 +0100 5656949 http://www.medworm.com/index.php?rid=5656948&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3787 The optical torque wrench is a laser trapping technique that expands the capability of standard optical tweezers to torque manipulation and measurement, using the laser linear polarization to orient tailored microscopic birefringent particles. The ability to measure torque of the order of kBT ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656948 Wed, 01 Feb 2012 05:00:00 +0100 5656948 http://www.medworm.com/index.php?rid=5656947&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3781 A network-embedded self-tuning cavity is proved in wavelength division multiplexed passive optical network transmission over 32 channels. The external source-less topology takes advantage of a reflective element at the remote node and a reflective semiconductor optical amplifier at the optical ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656947 Wed, 01 Feb 2012 05:00:00 +0100 5656947 http://www.medworm.com/index.php?rid=5656978&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3773 We have developed a wavelength-scale embedded active-region photonic-crystal laser using lateral p-i-n structure. Zn diffusion and Si ion implantation are used for p- and n-type doping. Room-temperature continuous-wave lasing behavior is clearly observed from the injection current dependence of the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656978 Tue, 31 Jan 2012 05:00:00 +0100 5656978 http://www.medworm.com/index.php?rid=5656977&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3753 The state of spatially correlated down-converted photons is usually treated as a two-mode Gaussian entangled state. While intuitively this seems to be reasonable, it is known that new structures in the spatial distributions of these photons can be observed when the phase-matching conditions are ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656977 Tue, 31 Jan 2012 05:00:00 +0100 5656977 http://www.medworm.com/index.php?rid=5656976&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3744 Recently, we have proposed a method to image fluorescent structures behind turbid layers at diffraction limited resolution using wave-front shaping and the memory effect. However, this was limited to a raster scanning of the wave-front shaped focus to a two dimensional plane. In applications, it ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656976 Tue, 31 Jan 2012 05:00:00 +0100 5656976 http://www.medworm.com/index.php?rid=5656975&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3733 Overall performance of a thin film solar cell is determined by the efficiency of converting photons to electrons through light absorption, carrier generation, and carrier collection. Recently, photon management has emerged as a powerful tool to further boost this conversion efficiency. Here we ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656975 Tue, 31 Jan 2012 05:00:00 +0100 5656975 http://www.medworm.com/index.php?rid=5656974&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3725 Single 32.6 eV high harmonic pulses from a time-delay compensated monochromator were compressed down to 11 ± 3 fs by completely compensating for the pulse-front tilt. The photon flux was intensified up to 5.7×10^9 photons/s on target by implementing high harmonic generation under a ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656974 Tue, 31 Jan 2012 05:00:00 +0100 5656974 http://www.medworm.com/index.php?rid=5656973&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3711 We propose and demonstrate a scheme for strong radial confinement of a single ^87Rb atom by a bichromatic far-off resonance optical dipole trap (BFORT). The BFORT is composed of a blue-detuned Laguerre-Gaussian LG01 beam and a red-detuned Gaussian beam. The atomic oscillation frequency ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656973 Tue, 31 Jan 2012 05:00:00 +0100 5656973 http://www.medworm.com/index.php?rid=5656972&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3703 The dispersed fringe sensor (DFS) has been demonstrated as an effective means of measuring mirror segment piston error for telescopes with primary mirror apertures below 10 meters. With larger proposed telescopes such as The Thirty Meter Telescope (TMT) and The European Large Telescope (ELT) ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656972 Tue, 31 Jan 2012 05:00:00 +0100 5656972 http://www.medworm.com/index.php?rid=5656971&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3693 We study the interaction of an incident plane wave with a metamaterial periodic structure consisting of alternating layers of positive and negative refractive index with average zero refractive index. We show that the existence of very narrow resonance peaks for which giant absorption - 50% at ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656971 Tue, 31 Jan 2012 05:00:00 +0100 5656971 http://www.medworm.com/index.php?rid=5656970&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3675 In this paper a study of waveguide photodetectors based on InAs/InP(100) quantum dot (QD) active material are presented for the first time. These detectors are fabricated using the layer stack of semiconductor optical amplifiers (SOAs) and are compatible with the active-passive integration ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656970 Tue, 31 Jan 2012 05:00:00 +0100 5656970 http://www.medworm.com/index.php?rid=5656969&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3663 The polarizability of a nanostructure is an important parameter that determines the optical properties. An exact semi-analytical solution of the electrostatic polarizability of a general geometry consisting of two segments forming a cylinder that can be arbitrarily buried in a substrate is derived ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656969 Tue, 31 Jan 2012 05:00:00 +0100 5656969 http://www.medworm.com/index.php?rid=5656968&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3654 We present systematic experimental investigations on the effects of laser polarization and interface orientation in second and third harmonic generation microscopy. We find that the laser polarization has no measurable effect on signal strength and resolution in third harmonic microscopy, while the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656968 Tue, 31 Jan 2012 05:00:00 +0100 5656968 http://www.medworm.com/index.php?rid=5656967&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3642 Picture-generating freeform surfaces are able to generate a picture in a defined plane by incoherent beam shaping comparable to illumination purposes. No classical imaging is performed. Therefore the classical Rayleigh criterion of the diffraction limit cannot be applied. In this paper, we ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656967 Tue, 31 Jan 2012 05:00:00 +0100 5656967 http://www.medworm.com/index.php?rid=5656966&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3633 A multi-beam bilateral teleoperation system of holographic optical tweezers accelerated by a graphics processing unit is proposed and evaluated. This double-arm teleoperation system is composed of two haptic devices and two laser-trapped micro-beads. Each micro-bead is trapped and moved following ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5656966 Tue, 31 Jan 2012 05:00:00 +0100 5656966 http://www.medworm.com/index.php?rid=5644113&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3620 We develop and experimentally verify a theory of evolution of polarization in artificially-disordered multi-mode optical fibers. Starting with a microscopic model of photo-induced index change, we obtain the first and second order statistics of the dielectric tensor in a Ge-doped fiber, where a ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644113 Mon, 30 Jan 2012 05:00:00 +0100 5644113 http://www.medworm.com/index.php?rid=5644112&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3613 We study the case of two simultaneous three-wave-mixing processes, where one frequency is converted to another through an intermediate frequency. The common assumption is that these processes can occur only when the material is transparent at all participating frequencies. Here we show ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644112 Mon, 30 Jan 2012 05:00:00 +0100 5644112 http://www.medworm.com/index.php?rid=5644111&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3586 Extraneous thermal motion can limit displacement sensitivity and radiation pressure effects, such as optical cooling, in a cavity-optomechanical system. Here we present an active noise suppression scheme and its experimental implementation. The main challenge is to selectively sense and suppress ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644111 Mon, 30 Jan 2012 05:00:00 +0100 5644111 http://www.medworm.com/index.php?rid=5644110&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3580 A transmission-grating-modulated time-resolved pump-probe absorption spectroscopy is developed and formularized. The spectroscopy combines normal time-resolved pump-probe absorption spectroscopy with a binary transmission grating, is sensitive to the spatiotemporal evolution of photoinjected ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644110 Mon, 30 Jan 2012 05:00:00 +0100 5644110 http://www.medworm.com/index.php?rid=5644109&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3572 We propose and demonstrate a novel device structure of resonant cavity-enhanced photodetector (RCE-PD). The new RCE-PD structure consists of a bottom distributed Bragg reflector (DBR), a cavity with InGaAs multiple quantum wells (MQWs) for light absorption and a top mirror of sub-wavelength ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644109 Mon, 30 Jan 2012 05:00:00 +0100 5644109 http://www.medworm.com/index.php?rid=5644108&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3563 The internal energy flow in a light beam can be divided into the “orbital” and “spin” parts, associated with the spatial and polarization degrees of freedom of light. In contrast to the orbital one, experimental observation of the spin flow seems problematic because it ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644108 Mon, 30 Jan 2012 05:00:00 +0100 5644108 http://www.medworm.com/index.php?rid=5644107&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3556 Planar-lightwave-circuit (PLC)-type graphene polarizers are fabricated by using a low loss optical polymer waveguide. The optical characteristics are investigated at a wavelength of 1.31 µm. By interface engineering with a UV-curable perfluorinated acrylate polymer resin, the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644107 Mon, 30 Jan 2012 05:00:00 +0100 5644107 http://www.medworm.com/index.php?rid=5644106&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3550 We report the first room temperature optical spin-injection of a dilute nitride 1300 nm vertical-cavity surface-emitting laser (VCSEL) under continuous-wave optical pumping. We also present a novel experimental protocol for the investigation of optical spin-injection with a fiber setup. The ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644106 Mon, 30 Jan 2012 05:00:00 +0100 5644106 http://www.medworm.com/index.php?rid=5644105&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3541 We propose and demonstrate a novel first-order polarization mode dispersion (PMD) compensator separating principal-states-of-polarization (PSP) control from differential-group-delay (DGD) control by using two independent feedback monitoring signals. To verify the proposed operating principle, we ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644105 Mon, 30 Jan 2012 05:00:00 +0100 5644105 http://www.medworm.com/index.php?rid=5644104&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3529 We propose a hologram calculation technique that enables reconstructing a shaded three-dimensional (3D) image. The amplitude distributions of zone plates, which generate the object points that constitute a 3D object, were two-dimensionally modulated. Two-dimensional (2D) amplitude modulation was ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644104 Mon, 30 Jan 2012 05:00:00 +0100 5644104 http://www.medworm.com/index.php?rid=5644103&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3519 We develop novel designs enabling slow-light propagation with vanishing group-velocity dispersion (“frozen light”) and slow-light with large delay-bandwidth product, in periodic nanowires. Our design is based on symmetry-breaking of periodic nanowire waveguides and we demonstrate its ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644103 Mon, 30 Jan 2012 05:00:00 +0100 5644103 http://www.medworm.com/index.php?rid=5644102&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3509 We demonstrate coherent control of spontaneous emission from an indirectly coupled transition in a microwave driven four-level atomic system. The transition of concern is not directly coupled by any laser fields, while the ground state is coupled to another ground state by a microwave field. We ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644102 Mon, 30 Jan 2012 05:00:00 +0100 5644102 http://www.medworm.com/index.php?rid=5644101&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3499 Structural changes caused by the optically induced helical inversion in the cholesteric liquid crystal cells with homeotropic anchoring are studied. In a one-step exposure, a sequence of structural transformations “lying left-handed helix – unwound homeotropic state – lying ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644101 Mon, 30 Jan 2012 05:00:00 +0100 5644101 http://www.medworm.com/index.php?rid=5644100&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3490 A femtosecond optical parametric oscillator (OPO) based on silicon-on-insulator (SOI) waveguide is proposed and analyzed numerically. By utilizing split-step Fourier method (SSFM), it is demonstrated that ultra-wide tunable wavelength femtosecond pulse can be realized under the phase matching ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644100 Mon, 30 Jan 2012 05:00:00 +0100 5644100 http://www.medworm.com/index.php?rid=5644099&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3479 Two-dimensional (2D) Si-nanorod arrays offer a promising architecture that has been widely recognized as attractive devices for photovoltaic applications. To further reduce the Fresnel reflection that occurs at the interface between the air and the 2D Si-nanorod array because of the large ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644099 Mon, 30 Jan 2012 05:00:00 +0100 5644099 http://www.medworm.com/index.php?rid=5644098&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3473 The maximum reach in a WDM-PON using a broadband light source (BLS) seeded optical source has been experimentally evaluated by taking into account both effects of dispersion-induced pulse broadening and excess intensity noise (EIN) increase. In order to investigate the impact of BLS seed source ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644098 Mon, 30 Jan 2012 05:00:00 +0100 5644098 http://www.medworm.com/index.php?rid=5644097&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3467 A photonic crystal fiber is optimized for chromatic dispersion compensation by using inner cladding modes. To this end, a photonic-oriented version of the downhill-simplex algorithm is employed. The numerical results show a dispersion profile that accurately compensates the targeted dispersion ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644097 Mon, 30 Jan 2012 05:00:00 +0100 5644097 http://www.medworm.com/index.php?rid=5644096&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3456 We demonstrate a high-accuracy distributed fiber-optic temperature sensor using superconducting nanowire single-photon detectors and single-photon counting techniques. Our demonstration uses inexpensive single-mode fiber at standard telecommunications wavelengths as the sensing fiber, which enables ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644096 Mon, 30 Jan 2012 05:00:00 +0100 5644096 http://www.medworm.com/index.php?rid=5644095&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3443 In an optically synchronized short-pulse optical-parametric chirped-pulse amplification (OPCPA) system, we observe a few-100 fs-scale timing jitter. With an active timing stabilization system slow fluctuations are removed and the timing jitter can be reduced to 100 fs standard deviation (Std). As ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644095 Mon, 30 Jan 2012 05:00:00 +0100 5644095 http://www.medworm.com/index.php?rid=5644094&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3434 A diode-pumped, ultrafast Yb:KYW laser system utilizing chirped-pulse amplification in a dual-slab regenerative amplifier with spectral shaping of seeding pulse from a master oscillator has been developed. A train of compressed pulses with pulse length of 181 fs, repetition rate up to 200 kHz, and ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644094 Mon, 30 Jan 2012 05:00:00 +0100 5644094 http://www.medworm.com/index.php?rid=5644093&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3424 Optical features of point defects photoluminescence in LiF crystals, irradiated by soft X-ray pulses of the Free Electron Laser with wavelengths of 17.2 – 61.5 nm, were measured. We found that peak of photoluminescence spectra lies near of 530 nm and are associated with emission of F_3 ^+ ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644093 Mon, 30 Jan 2012 05:00:00 +0100 5644093 http://www.medworm.com/index.php?rid=5644092&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3408 We present the numerical and experimental demonstration of plasmonic Bragg filters and resonators inside metal-insulator-metal (MIM) waveguides. The presented filters and resonators are fabricated using standard top down lithography methods. The optical bandgap of the integrated Bragg filters is ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644092 Mon, 30 Jan 2012 05:00:00 +0100 5644092 http://www.medworm.com/index.php?rid=5644091&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3401 The application of an innovative spectroscopic balancing technique to measure the isotope ^18O/^16O ratio in water vapor is reported. Quartz enhanced photoacoustic spectroscopy has been employed as the absorption sensing technique. Two isotope absorption lines with the same quantum numbers, with ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644091 Mon, 30 Jan 2012 05:00:00 +0100 5644091 http://www.medworm.com/index.php?rid=5644090&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3394 Single pulse energies as high as 145 µJ were generated with a passively Q-switched diode-pumped Tm:KLu(WO_4)_2 laser using poly-crystalline Cr^2+:ZnS as a saturable absorber. The maximum average power reached 0.39 W at a pulse repetition rate of 2.7 kHz with pulse durations in the 25 – ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644090 Mon, 30 Jan 2012 05:00:00 +0100 5644090 http://www.medworm.com/index.php?rid=5644089&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3388 We present the first experimental technique to encrypt a movie under a joint transform correlator architecture. We also extend the method to multiplex several movies in a single package. We use a Mach-Zehnder interferometer to encrypt experimentally each movie. One arm of the interferometer is the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644089 Mon, 30 Jan 2012 05:00:00 +0100 5644089 http://www.medworm.com/index.php?rid=5644088&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3375 In this paper, we propose the SPR (sparse phase retrieval) method, which is a new phase retrieval method for coherent x-ray diffraction imaging (CXDI). Conventional phase retrieval methods effectively solve the problem for high signal-to-noise ratio measurements, but would not be sufficient for ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644088 Mon, 30 Jan 2012 05:00:00 +0100 5644088 http://www.medworm.com/index.php?rid=5644087&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-4-3367 We demonstrate an integrated microparticle passive sorting system based on the near-field optical forces exerted by a 3-dB optical splitter that consists of a slot waveguide and a conventional channel waveguide. We show that 320 nm and 2 µm polystyrene particles brought into the splitter are ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5644087 Mon, 30 Jan 2012 05:00:00 +0100 5644087 http://www.medworm.com/index.php?rid=5635752&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3353 An automated chorio-scleral interface (CSI) detection algorithm based on polarization sensitive optical coherence tomography (PS-OCT) is presented. This algorithm employs a two-step scheme based on the phase retardation variation detected by PS-OCT. In the first step, a rough CSI segmentation is ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635752 Fri, 27 Jan 2012 05:00:00 +0100 5635752 http://www.medworm.com/index.php?rid=5635751&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3345 Planar metamaterials consisting of subwavelength resonators have been recently proposed for thin dielectric film sensing in the terahertz frequency range. Although the thickness of the dielectric film can be very small compared with the wavelength, the required area of sensed material is still ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635751 Fri, 27 Jan 2012 05:00:00 +0100 5635751 http://www.medworm.com/index.php?rid=5635750&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3331 We numerically and experimentally demonstrate efficient generation of an equalized optical comb with 150-nm bandwidth. The comb was generated by low-power, continuous-wave seeds, eliminating the need for pulsed laser sources. The new architecture relies on efficient creation of higher-order mixing ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635750 Fri, 27 Jan 2012 05:00:00 +0100 5635750 http://www.medworm.com/index.php?rid=5635749&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3325 A new optical design for an autocorrelator using a double wedge is proposed and experimentally demonstrated. It consists of two wedges placed in a mirror-image configuration. Instead of splitting a beam by 90 degree angle as done in a conventional autocorrelator based on Michelson interferometer, ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635749 Fri, 27 Jan 2012 05:00:00 +0100 5635749 http://www.medworm.com/index.php?rid=5635748&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3311 We report the use of a high-refractive-index aplanatic solid immersion lens (ASIL) in total internal reflection fluorescence (TIRF) microscopy. This new solid immersion total internal reflection fluorescence (SITIRF) microscopy allows highly confined surface imaging with a significantly reduced ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635748 Fri, 27 Jan 2012 05:00:00 +0100 5635748 http://www.medworm.com/index.php?rid=5635747&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3302 We studied the transient behaviors of current-injection quantum-dot microdisk lasers at room temperature. Unique optical responses were observed, including the suppression of relaxation oscillations and fast turn-on. With the help of rate-equation modeling, the suppressed relaxation oscillations ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635747 Fri, 27 Jan 2012 05:00:00 +0100 5635747 http://www.medworm.com/index.php?rid=5635746&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3296 We have demonstrated a monolithic cladding-pumped ytterbium-doped single all-fiber laser oscillator generating 1 kW of CW signal power at 1080 nm with 71% slope efficiency and near diffraction-limited beam quality. Fiber components were highly integrated on “spliceless” passive fibers ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635746 Fri, 27 Jan 2012 05:00:00 +0100 5635746 http://www.medworm.com/index.php?rid=5635745&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3275 We present power conversion efficiency (PCE) and luminous efficiency (LE) performance levels of high photometric quality white LEDs integrated with quantum dots (QDs) achieving an averaged color rendering index of ≥90 (with R9 at least 70), a luminous efficacy of optical radiation of ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635745 Fri, 27 Jan 2012 05:00:00 +0100 5635745 http://www.medworm.com/index.php?rid=5635744&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3268 Optical self seeding feedback techniques can be used to improve the noise characteristics of passively mode-locked laser diodes. External cavities such as fiber optic cables can increase the memory of the phase and subsequently improve the timing jitter. In this work, an improved optical feedback ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635744 Fri, 27 Jan 2012 05:00:00 +0100 5635744 http://www.medworm.com/index.php?rid=5635743&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3261 We measure the motional fluctuations of a micromechanical mirror using a Michelson interferometer, and demonstrate its interferometric stability. The position stability of the micromirror is dominated by the thermal mechanical noise of the structure. With this level of stability, we utilize the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635743 Fri, 27 Jan 2012 05:00:00 +0100 5635743 http://www.medworm.com/index.php?rid=5635742&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3250 Localized surface plasmon resonance (LSPR) has shown its remarkable applications in biosensing, bioimaging, and nanophotonics. Unlike surface plasmon polariton (SPP), the current studies regarding LSPR as biosensor were restricted in probing the extinction spectra, and thus limit the performance in ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635742 Fri, 27 Jan 2012 05:00:00 +0100 5635742 http://www.medworm.com/index.php?rid=5635741&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3241 Many information processing challenges are difficult to solve with traditional Turing or von Neumann approaches. Implementing unconventional computational methods is therefore essential and optics provides promising opportunities. Here we experimentally demonstrate optical information processing ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635741 Fri, 27 Jan 2012 05:00:00 +0100 5635741 http://www.medworm.com/index.php?rid=5635763&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3235 We have substantially improved the performance of interband cascade lasers emitting at λ = 4.7 and 5.6 μm, by applying the recently-pioneered approach of heavily doping the injector regions to rebalance the electron and hole concentrations in the active quantum wells. Ridges of ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635763 Thu, 26 Jan 2012 05:00:00 +0100 5635763 http://www.medworm.com/index.php?rid=5635762&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3225 Advanced modulation schemes together with coherent detection and digital signal processing has enabled the next generation high-bandwidth optical communication systems. One of the key advantages of coherent detection is its superior receiver sensitivity compared to direct detection receivers due to ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635762 Thu, 26 Jan 2012 05:00:00 +0100 5635762 http://www.medworm.com/index.php?rid=5635761&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3219 We report on high speed operation of a Ge/SiGe multiple quantum well (MQW) electro-absorption modulator in a waveguide configuration. 23 GHz bandwidth is experimentally demonstrated from a 3 µm wide and 90 µm long Ge/SiGe MQW waveguide. The modulator exhibits a high extinction ratio of ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635761 Thu, 26 Jan 2012 05:00:00 +0100 5635761 http://www.medworm.com/index.php?rid=5635760&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3209 We demonstrate a carrier-depletion Mach-Zehnder silicon optical modulator, which is compatible with CMOS fabrication process and works well at a low driving voltage. This is achieved by the optimization of the coplanar waveguide electrode to reduce the electrical signal transmission loss. At the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635760 Thu, 26 Jan 2012 05:00:00 +0100 5635760 http://www.medworm.com/index.php?rid=5635759&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3200 We present a novel approach for convenient tuning of the local refractive index around nanostructures. We apply this technique to study the influence of the local refractive index on the radiative decay time of CdSe/ZnS quantum dots with three distinct emission wavelengths. The dependence of the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635759 Thu, 26 Jan 2012 05:00:00 +0100 5635759 http://www.medworm.com/index.php?rid=5635758&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3192 We design a slotted photonic crystal waveguide (S-PhCW) and numerically propose that it can efficiently transport polystyrene particle with diameter as small as 50 nm in a 100 nm slot. Excellent optical confinement and slow light effect provided by the photonic crystal structure greatly enhance the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635758 Thu, 26 Jan 2012 05:00:00 +0100 5635758 http://www.medworm.com/index.php?rid=5635757&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3176 Two schemes for the preparation of weighted continuous variable cluster states with four atomic ensembles are proposed. In the first scheme, the four separated atomic ensembles inside a two-mode ring cavity are driven by pulse laser fields. The basic idea of the scheme is to transfer the ensemble ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635757 Thu, 26 Jan 2012 05:00:00 +0100 5635757 http://www.medworm.com/index.php?rid=5635756&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3166 Optical monitoring is applied, in situ and in real time, to non-Newtonian, power law fluids in the spin coating process. An analytical exact solution is presented for thickness evolution that well fits to most measurement data. As result, typical rheological parameters are obtained for several CMC ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635756 Thu, 26 Jan 2012 05:00:00 +0100 5635756 http://www.medworm.com/index.php?rid=5635755&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3158 We propose and numerically demonstrate an integrated fiber-coupled launcher for slow surface plasmon-polaritons. The device is based on a novel plasmonic mode-converter providing efficient power transfer from the fast to the slow modes of a metallic nanostripe. Total coupling efficiency with ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635755 Thu, 26 Jan 2012 05:00:00 +0100 5635755 http://www.medworm.com/index.php?rid=5635754&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3152 The ability to control light over very small distances is a problem of fundamental importance for a vast range of applications in communications, nanophotonics, and quantum information technologies. For this purpose, several methods ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635754 Thu, 26 Jan 2012 05:00:00 +0100 5635754 http://www.medworm.com/index.php?rid=5635753&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3144 We report measurements of the fluorescence decay times of CdSe/ZnS core-shell quantum dots at the air-dielectric interface for several dielectrics with different refractive indices. The results are in agreement with a simple theory that accounts for the impact of the refractive index on the density ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635753 Thu, 26 Jan 2012 05:00:00 +0100 5635753 http://www.medworm.com/index.php?rid=5635778&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3129 Lensfree in-line holographic microscopy offers sub-micron resolution over a large field-of-view (e.g., ~24 mm^2) with a cost-effective and compact design suitable for field use. However, it is limited to relatively low-density samples. To mitigate this limitation, we demonstrate an on-chip imaging ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635778 Wed, 25 Jan 2012 05:00:00 +0100 5635778 http://www.medworm.com/index.php?rid=5635777&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3118 We observe mixed two- and three-photon absorption in bulk rutile (TiO_2) around 800 nm using the open aperture Z-scan technique. We fit the data with an extended model that includes multiphoton absorption, beam quality, and ellipticity. The extracted two- and three-photon absorption coefficients ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635777 Wed, 25 Jan 2012 05:00:00 +0100 5635777 http://www.medworm.com/index.php?rid=5635776&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3110 Line-by-line pulse shaping is demonstrated on a 890 MHz repetition rate mode-locked titanium sapphire laser. The high resolution pulse shaper is based on a virtual imaged phased array (VIPA) with a free spectral range of 25 GHz. For our implementation, the mask repeats every VIPA free spectral ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635776 Wed, 25 Jan 2012 05:00:00 +0100 5635776 http://www.medworm.com/index.php?rid=5635775&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3098 We proposed a novel optical coupling technique based on two parallel singlemode-multimode- singlemode (SMS) fiber structures. This technique utilizes one SMS structure to excite multiple cladding modes within an output singlemode fiber. The excited multiple cladding modes will be coupled to the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635775 Wed, 25 Jan 2012 05:00:00 +0100 5635775 http://www.medworm.com/index.php?rid=5635774&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3091 We demonstrate a nanoscale optical reinforcement concept for reversible holographic recording. The bone-muscle-like mechanism enables enhancement of holographic grating formation due to the collective alignment of liquid crystal (LC) molecules nearby photo-reconfigurable polymer backbones. The LC ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635774 Wed, 25 Jan 2012 05:00:00 +0100 5635774 http://www.medworm.com/index.php?rid=5635773&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3082 Real-time photoacoustic (PA) imaging involves beamforming methods using an assumed fixed sound speed, typically 1540 m/s in soft tissue. This leads to degradation of PA image quality because the true sound speed changes as PA signal propagates through different types of soft tissues: the range from ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635773 Wed, 25 Jan 2012 05:00:00 +0100 5635773 http://www.medworm.com/index.php?rid=5635772&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3076 We present a two-color pumped OPCPA system which delivers an ultra-broadband spectrum spanning from 430 nm to 1.3 µm with a Fourier limited pulse duration of sub-3 fs and 1 µJ of pulse energy at a repetition rate of 200 kHz. All frequency components propagate on a common path, thus the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635772 Wed, 25 Jan 2012 05:00:00 +0100 5635772 http://www.medworm.com/index.php?rid=5635771&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3066 Silica microspheres are probed with a dual comb interferometry setup. The impulse responses of these microresonators are measured with a temporal resolution smaller than 400 fs over more than 200 ps. The amplitudes and phases of the impulse responses are interpreted as providing sensing ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635771 Wed, 25 Jan 2012 05:00:00 +0100 5635771 http://www.medworm.com/index.php?rid=5635770&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3057 Bio-mechanism investigations demand single particle tracking with high spatial and temporal resolutions which require single fluorophore 3D localization measurements with matching precision and speed. Although the precision for lateral-localization measurements is well described by an analytical ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635770 Wed, 25 Jan 2012 05:00:00 +0100 5635770 http://www.medworm.com/index.php?rid=5635769&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3043 A novel technique, designated dual imaging and modeling evaluation (DIME), for evaluating single-laser shot fluorescence lifetimes is presented. The technique is experimentally verified in a generic gas mixing experiment to provide a clear demonstration of the rapidness and sensitivity of the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635769 Wed, 25 Jan 2012 05:00:00 +0100 5635769 http://www.medworm.com/index.php?rid=5635768&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3034 We demonstrate a fully continuous liquid crystal (LC) grating device with the alternating semi-circular alignment which exhibits the switching effect between the diffraction orders independent of the thickness of the LC cell. The continuous phase modulation in the LC grating with the rotational ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635768 Wed, 25 Jan 2012 05:00:00 +0100 5635768 http://www.medworm.com/index.php?rid=5635767&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3015 We present a numerical study of the structural properties, photonic density of states and bandedge modes of Vogel spiral arrays of dielectric cylinders in air. Specifically, we systematically investigate different types of Vogel spirals obtained by the modulation of the divergence angle parameter ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635767 Wed, 25 Jan 2012 05:00:00 +0100 5635767 http://www.medworm.com/index.php?rid=5635766&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-3005 The authors demonstrated an efficient color conversion layer (CCL) by using nanosphere arrays in down-converted white organic light-emitting diodes (WOLEDs). The introduced periodical nanospheres not only helped extract the confined light in devices, but also increased the effective light path to ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635766 Wed, 25 Jan 2012 05:00:00 +0100 5635766 http://www.medworm.com/index.php?rid=5635765&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2992 Recently, several theoretical papers have derived relationships for fiber-optic transmission system performance in terms of associated physical layer parameters. At the same time, a large number of detailed experiments have been and continue being performed that demonstrate increasing capacities ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635765 Wed, 25 Jan 2012 05:00:00 +0100 5635765 http://www.medworm.com/index.php?rid=5635764&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2982 Ternary metal oxide, Zn_2GeO_4, In_2Ge_2O_7, have potential applications in many research areas. Using a single chemical vapor deposition method, high-quality single crystalline Zn_2GeO_4 nanowire (NW) mats and In_2Ge_2O_7 NW mats were synthesized on a large scale. Nanowires mats based ultraviolet ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5635764 Wed, 25 Jan 2012 05:00:00 +0100 5635764 http://www.medworm.com/index.php?rid=5625056&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2932 We experimentally investigate the fluorescence photon emission characteristics for single q-dots by using optical nanofibers. We demonstrate that single q-dots can be deposited along an optical nanofiber systematically and reproducibly with a precision of 5 μm. For single q-dots on an optical ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625056 Tue, 24 Jan 2012 05:00:00 +0100 5625056 http://www.medworm.com/index.php?rid=5625055&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2911 We present high-speed operation of pin-diode-based silicon Mach-Zehnder modulators that have side-wall gratings on both sides of the waveguide core. The use of pre-emphasis signals generated with a finite impulse response digital filter was examined in the frequency domain to show how the filter ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625055 Tue, 24 Jan 2012 05:00:00 +0100 5625055 http://www.medworm.com/index.php?rid=5625054&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2974 We report an electro-optically tunable photonic crystal linear cavity etched on a 200 nm lithium niobate waveguide ridge. The photonic crystal cavity and the ridge are both fabricated on a 1 μm thin film of lithium niobate obtained by smart-cut technology. The photonic crystal, of area 4x0.8 ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625054 Tue, 24 Jan 2012 05:00:00 +0100 5625054 http://www.medworm.com/index.php?rid=5625053&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2967 The shape of a multi-core optical fiber is calculated by numerically solving a set of Frenet-Serret equations describing the path of the fiber in three dimensions. Included in the Frenet-Serret equations are curvature and bending direction functions derived from distributed fiber Bragg grating ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625053 Tue, 24 Jan 2012 05:00:00 +0100 5625053 http://www.medworm.com/index.php?rid=5625052&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2956 In this paper, we proposed and demonstrated a new correlation imaging mechanism based on the periodic diffraction effect. In this effect, a periodic intensity pattern is generated at the output surface of a periodic point source array. This novel correlation imaging mechanism can realize ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625052 Tue, 24 Jan 2012 05:00:00 +0100 5625052 http://www.medworm.com/index.php?rid=5625051&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2942 In this study, nanoimprint lithography (NIL) was proposed to produce high frequency moiré gratings on metal samples. A new type of NIL mold and a hot embossing system were ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625051 Tue, 24 Jan 2012 05:00:00 +0100 5625051 http://www.medworm.com/index.php?rid=5625050&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2924 By deviating the nanodisk from the center in the silver nanocrescent/nanodisk structure, we find that the dipole, quadrupole and octupole modes can all induce very high local electric field enhancement (LFE, more than 750) for the coupling of nanocrescent and crescent gap modes, which makes the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625050 Tue, 24 Jan 2012 05:00:00 +0100 5625050 http://www.medworm.com/index.php?rid=5625049&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2905 This work demonstrates an actively mode-locked fiber laser operating in soliton regime and employing an all-fiber electro-optic modulator. Nonlinear polarization rotation is utilized for femtosecond pulse generation. Stable operation of the all-fiber ring laser is readily achieved at a fundamental ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625049 Tue, 24 Jan 2012 05:00:00 +0100 5625049 http://www.medworm.com/index.php?rid=5625048&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2895 We derive the analytical expression for the propagation of elegant Hermite-cosine-Gaussian (EHcosG) beams through a paraxial ABCD optical system and use it to study the radiation forces produced by highly focused this kind of beams acting on a Rayleigh dielectric sphere. Owing to the ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625048 Tue, 24 Jan 2012 05:00:00 +0100 5625048 http://www.medworm.com/index.php?rid=5625047&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2887 We report extensive numerical studies on plasmonic dimers of different configurations and find that their coupling effects can be categorized into three types of phenomena. First, like ordinary mechanical systems, the plasmonic dimers can exhibit positive couplings that show anti-crossing behavior. ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625047 Tue, 24 Jan 2012 05:00:00 +0100 5625047 http://www.medworm.com/index.php?rid=5625046&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2881 We report on the development of a high-peak-power, single-longitudinal-mode and tunable injection-seeded terahertz-wave parametric generator using MgO:LiNbO_3, which operates at room temperature. The high peak power (> 120 W) is enough to allow easy detection by commercial and calibrated ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625046 Tue, 24 Jan 2012 05:00:00 +0100 5625046 http://www.medworm.com/index.php?rid=5625076&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2876 Based on Maxwell’s equations and Mie theory, strong sub-wavelength artificial magnetic and electric dipole resonances can be excited within dielectric resonators, and their resonant frequencies can be tailored simply by scaling the size of the dielectric resonators. Therefore, in this work ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625076 Mon, 23 Jan 2012 05:00:00 +0100 5625076 http://www.medworm.com/index.php?rid=5625075&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2858 We have previously demonstrated that Mie scattering of partially coherent plane waves can create coherence vortices, namely screw-type dislocations in the phase of the spectral degree of coherence. However, plane waves are an idealization and in practice, optical beams are often much closer to ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625075 Mon, 23 Jan 2012 05:00:00 +0100 5625075 http://www.medworm.com/index.php?rid=5625074&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2851 We experimentally investigate the noise properties of picosecond supercontinuum spectra generated at different power levels in uniform and tapered photonic crystal fibers. We show that the noise at the spectral edges of the generated supercontinuum is at a constant level independent on the pump ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625074 Mon, 23 Jan 2012 05:00:00 +0100 5625074 http://www.medworm.com/index.php?rid=5625073&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2844 A novel fiber-optic twist sensor based on a dual-polarization distributed Bragg reflector (DBR) fiber grating laser is proposed and experimentally demonstrated. By beating the signal between the two polarizations of the laser which operates at 1543.154nm, a signal of 30.78MHz in frequency domain is ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625073 Mon, 23 Jan 2012 05:00:00 +0100 5625073 http://www.medworm.com/index.php?rid=5625072&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2835 A practical measurement procedure for the determination of the complex refractive index of strongly absorbing liquids within a finite spectral range was developed. The method is based on separate measurements of reflectance and transmittance of the liquid sample, a property of dispersion and ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625072 Mon, 23 Jan 2012 05:00:00 +0100 5625072 http://www.medworm.com/index.php?rid=5625071&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2832 An incomplete modeling of the scattering forces on a Rayleigh particle without taking into account the light spin forces in “Trapping metallic Rayleigh particles with radial polarization” by Q. Zhan, leads to erroneous statements on the advantages of using radial polarization to trap ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625071 Mon, 23 Jan 2012 05:00:00 +0100 5625071 http://www.medworm.com/index.php?rid=5625070&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2824 We present the first study of the photosensitivity of GeS binary glasses in response to irradiation to femtosecond pulses at 800nm. A maximum positive refractive index change of 3.5x10^−3 is demonstrated with the possibility to control the waveguide diameter from ~8 to ~50 µm by ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625070 Mon, 23 Jan 2012 05:00:00 +0100 5625070 http://www.medworm.com/index.php?rid=5625069&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2814 We present an extension of the direct-binary-search algorithm for designing high-efficiency multi-wavelength diffractive optics that reconstruct in the Fresnel domain. A fast computation method for solving the optimization problem is proposed. Examples of three-wavelength diffractive optics with ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625069 Mon, 23 Jan 2012 05:00:00 +0100 5625069 http://www.medworm.com/index.php?rid=5625068&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2806 We present an experimental method to characterize multi-photon detectors with a small overall detection efficiency. We do this by separating the nonlinear action of the multiphoton detection event from linear losses in the detector. Such a characterization is a necessary step for quantum ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625068 Mon, 23 Jan 2012 05:00:00 +0100 5625068 http://www.medworm.com/index.php?rid=5625067&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2789 We present here a theoretical study that compares ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625067 Mon, 23 Jan 2012 05:00:00 +0100 5625067 http://www.medworm.com/index.php?rid=5625066&cid=s_36568_75_f&fid=36568&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Doe-20-3-2779 We demonstrate 1 GHz count rate photon detection with photon number resolution by using a multi-pixel photon counter (MPPC) and performing baseline correction. A bare MPPC chip mounted on a high-frequency circuit board is employed to increase response speed. The photon number resolving capability ... (Source: Optics Express) Optics Express journals http://www.medworm.com/rss/comments.php?id=5625066 Mon, 23 Jan 2012 05:00:00 +0100 5625066