Highly Sensitive SPR Biosensor for Malaria Detection Employing ZnO, Fe2O3, and Black Phosphorous
AbstractA highly sensitive surface plasmon resonance biosensor employing BK7 prism, Silver (Ag), zinc oxide (ZnO), ferromagnetic material (Fe2O3), and two-dimensional (2D) nanomaterial black phosphorous (BP) has been proposed. Thin layers of two different oxide layers sandwiched between Ag and BP in Kretschmann configuration. The angular interrogation method –based numerical simulation is applied for modelling of high performance SPR biosensor at a wavelength of 633 nm (visible region). Transfer matrix method and finite element methods have been used to obtain [performance parameters. This sensor can detect malaria at d...
Source: Plasmonics - April 27, 2024 Category: Biomedical Science Source Type: research
An Ultra-Compact Surface Plasmon Transmission Line Based on Partially Grounded Coplanar Waveguide
AbstractIn this article, a new spoof surface plasmon polariton (SSPP) developed from partially grounded coplanar waveguides (PGCPW) is proposed. By utilizing folded-strip-type DGS, the dispersion characteristics can be controlled. Based on the equivalent circuit analyses, it is found that the proposed PGCPW SSPP features lower asymptotic frequency than the conventional grounded coplanar waveguides (GCPW) SSPP with the same size occupation. As a result, the proposed PGCPW SSPP has a smaller size occupation to obtain the same asymptotic frequency. To illustrate the design principle, the proposed PGCPW SSPP TL is designed, fa...
Source: Plasmonics - April 25, 2024 Category: Biomedical Science Source Type: research
Nickel Nanocluster as a Fluorescent Probe for the Non-enzymatic Detection of Cardiac Troponin I
AbstractTroponin I, as a cardiac-specific biomarker, is a very valuable tool in the identification of acute coronary syndromes. In this work, an economical technique for easy and sensitive diagnosis of cardiac troponin I (cTnI) was developed nanoprobe on the basis of graphene oxide quenching of the fluorescence of bovine serum albumin –capped fluorescent nickel (BSA@NiNCs) nanoclusters. The developed nanoprobe nickel nanocluster exhibited superparamagnetism. The nanoprobe showed a fluorescence turn-on behavior toward incremental addition of in cTnI, with a detection limit of 0.012 ng/mL. We successfully used the proposed...
Source: Plasmonics - April 23, 2024 Category: Biomedical Science Source Type: research
Surface Plasmon Resonance Sensing at the Interface of Doppler Broadening Dielectric Medium and Graphene
AbstractThe sensitivity of the surface plasmon polariton wave (SPPs) is coherently controlled and modified at the interface of four-level Doppler broadening dielectric medium and graphene. The useful control over the sensitivity of the SPPs under the Doppler broadening dielectric medium with system and driving fields parameters is reported. The sensitivity of SPPs is a function of probe and control field detuning, control field Rabi frequency, and decay rates. The high value of sensitivity is reported to 2700 deg/RIU with phase and decay rate, while small value of sensitivity is investigated to 320 deg/RIU with control fie...
Source: Plasmonics - April 22, 2024 Category: Biomedical Science Source Type: research
Fabrication of Long-Range Film of Flower-Like Ag Nanoparticles for Highly Sensitive SERS Substrate
AbstractThe fabrication of sensitive and homogeneous surface-enhanced Raman scattering (SERS) substrates is the key to its practical application. In this paper, flower-like silver nanoparticles (Ag NPs) were successfully synthesized in water/ethanol/n-octanol emulsions by an assistant of citric acid and sodium citrate. The size and surface roughness of flower-like Ag NPs can be adjusted by changing the experimental parameters, such as the ratio of citric acid to sodium citrate, and the concentration of ascorbic acid. The resulting flower-like Ag NPs were constructed to form a homogeneous single-layer film by a three-phase ...
Source: Plasmonics - April 20, 2024 Category: Biomedical Science Source Type: research
Synthesis of Au@NiO (Core@Shell) Nanoparticles via Laser Ablation on Silicon Nanostructures for Photodetector Application
AbstractThe synthesis of Au@NiO nanoparticles (NPs) core –shell involves a two-step method via laser ablation in aqueous solutions. Meanwhile, porous silicon is obtained using photoelectrochemically etching (PECE) of n-type silicon. The nanostructured Au@NiO deposited on a porous silicon layer is demonstrated using field-emission scanning electron micro scopy images, X-ray diffraction, and UV–vis absorption measurements. The creation of core–shell structure in Au@NiO nanoparticles was confirmed using X-ray diffraction, EDS, and UV–visible spectroscopy techniques. X-ray diffraction investigation indicates that the s...
Source: Plasmonics - April 20, 2024 Category: Biomedical Science Source Type: research
Freshly Prepared Graphene Oxide Nanoparticles ’ Wound-Healing Potential and Antibacterial Activity Specifically Against Staphylococcus aureus: In Vivo Efficacy and Clinical Isolate Evaluation
AbstractGraphene oxide (GO) exhibits several characteristics worthy of biomedical applications. The current study aimed to synthesize graphene oxide nanoparticles (GONPs) for antibacterial and wound-healing efficacy evaluations. The GONPs were prepared using Hummer ’s method and characterized by FT-IR, UV-Vis, Raman, SEM spectroscopic, and electron micrograph-based analyses, respectively, to confirm the structure and morphology. The analyses revealed GONPs as flaky, nano-sheeted structures with irregular shapes and sizes that were stacked on top of each othe r. The clinical isolates of gram-negative, i.e.,Escherichia col...
Source: Plasmonics - April 20, 2024 Category: Biomedical Science Source Type: research
Surface Plasmon Resonance Biosensor with High Sensitivity for Detecting SARS-CoV-2
AbstractThis paper presents a novel surface plasmon resonance (SPR) biosensor based on Kretchmann configuration for detection of SARS-CoV-2. The sensor incorporates barium titanate (BaTiO3) dielectric material on top of the metal as a 2D material, as well as tungsten disulfide (WS2) in addition to the prism/metal/sensing layer setup. To optimize the sensor ’s performance, the integration of emerging materials into conventional sensor structures was thoroughly examined, and key performance parameters were analyzed using the transfer matrix method (TMM) and Fresnel equations. The proposed sensor achieves exceptional angula...
Source: Plasmonics - April 19, 2024 Category: Biomedical Science Source Type: research
A New Perspective for Early Detection of Bone Tumour: Metamaterial-Based Antenna Solution
In this study, we designed a non-invasive mathematically supported antenna and tested this antenna on a clinically suitable tibia bone and tumour phantom. The results proved that bone tumour can be detected non-invasively with microwave antennas. (Source: Plasmonics)
Source: Plasmonics - April 18, 2024 Category: Biomedical Science Source Type: research
Graphene-Based Tunable High-Sensitivity Metasurface Refractive Index Sensor
AbstractA theoretical investigation and simulation of a terahertz metasurface refractive index sensor composed of graphene-metal is presented in this article. The analysis and evaluation of the reflector ’s performance are conducted through the implementation of the frequency-domain finite-difference method. The transmission and reflection spectra are analyzed in order to identify the characteristic dimensions that can enhance both sensitivity and reflectivity by optimizing the material’s thickn ess, cycle duration, and width of the etching structure. The findings indicate that the sensor exhibits a quality factor of 8...
Source: Plasmonics - April 17, 2024 Category: Biomedical Science Source Type: research
Optical Tamm States in 2D Nanostructured Magnetophotonic Structures
AbstractWe numerically explore optical Tamm states (OTS) supported by a photonic structure composed of a nanostructured metallic layer on top of a distributed Bragg reflector (DBR). Several polarizations, incidences and patterning are assessed to map OTS and their properties. We then gain magnetic control of the OTS by adding a cobalt layer below the metal pattern and switching its magnetization. This control, widely used in plasmonics, takes advantage of the Transverse Magneto-Optical Kerr Effect (TMOKE). The simulated TMOKE signal of this structure has an amplitude of the order of 10\(^{-3}\) and, compared to conventiona...
Source: Plasmonics - April 17, 2024 Category: Biomedical Science Source Type: research
Dynamic Tunable Liquid-Core Photonic Crystal Fiber Sensor Based on Graphene Plasmon
In this study, we investigate a liquid-core PCF-based graphene plasmonic sensor, where the analyte to be detected is located on both the sensing layer surface and the fiber core. As a result, the dispersion relations of both graphene plasmon (GP) and core-guide mode can be influenced by the analyte, leading to a negative refractive index (RI) wavelength sensitivity. This unique performance is attributed to the higher modulation degree of the core mode on the analyte RI ( Δneff.core) compared to that of the GP mode (Δneff.GP). By reducing the graphene Fermi energy, a positive sensibility is achieved with the modulation re...
Source: Plasmonics - April 16, 2024 Category: Biomedical Science Source Type: research
Correction to: Silver Nanoparticles Decorated Wide Band Gap MoS2 Nanosheet: Enhanced Optical and Electrical Properties
(Source: Plasmonics)
Source: Plasmonics - April 16, 2024 Category: Biomedical Science Source Type: research
Design and Analysis of Surface Plasmon Resonance Sensor with Open-Loop Side-Polished Photonic Crystal Fiber
AbstractA novel open-loop photonic crystal fiber (PCF) refractive index sensor based on the surface plasmon resonance effect is proposed. The gold film is applied to the surface of the air-core PCF to induce the SPR effect. The finite element method is employed to examine the influence of open-angle on the sensing performance. Simulation results show that the sensor is suitable for refractive index measurements ranging from 1.26 to 1.32 when the open-angle ranges from 90 to 130 °, demonstrating an average wavelength sensitivity of 1738 nm/RIU. As the angle varies from 140 to 180°, the sensor becomes more appropriate for ...
Source: Plasmonics - April 15, 2024 Category: Biomedical Science Source Type: research
Fabrication of Gold Thin Films on Cooled Glass Substrates
AbstractIn this article, gold (Au) thin films were fabricated on glass substrates under vacuum conditions (4.5 × 10−6 Torr) within a temperature range of 100–300 K, incrementing in steps of 50 K. Analyses through Field Emission Scanning Electron Microscopy (FESEM) revealed that at a substrate temperature of 230 K, the films featured spherical clusters of uniform size, e.g., 11–12 nm, suggesting that the s oliton growth mechanism predominates at this temperature. Atomic Force Microscopy (AFM) further demonstrated that the average surface roughness (Ra) of the Au films varied with the substrate temperature,...
Source: Plasmonics - April 15, 2024 Category: Biomedical Science Source Type: research
