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
The Role of the Polymer Matrix on the Energy Band Gap of Nanocomposites of Aluminium, Silver and Zinc Oxide
AbstractAchieving optimal optical properties for polymers matrix with Al, Ag and ZnO nano composites has received considerable attention due to their broad applications in advanced optical devices. Employing three unique polymers PS, PMMA, and PVA further compounded the outcomes. Energy dispersive X-ray imaging showed integrity for samples with different filler concentrations of Al, Ag, and ZnO nanoparticles. Furthermore, our UV visible transmittance spectrums showed low transmittance in the UV range but demonstrated an opposing correlation with nanoparticle concentrations. During the calculation of the energy band gap, it...
Source: Plasmonics - April 15, 2024 Category: Biomedical Science Source Type: research
Design and Development of a Split Ring Resonator and Circular Disc Metasurface Based Graphene/Gold Surface Plasmon Resonance Sensor for Illicit Drugs Detection
AbstractThis research introduces a novel sensor design integrating a metasurface composed of graphene and gold. The proposed sensor employs grating-assisted light coupling between a strip waveguide tailored for refractive index sensing in the detection of illicit drugs. The metasurface is composed of a polymer matrix consisting of two nanostructures, namely, a graphene matrix and a gold matrix. The structure is characterized by a structure where at least one dimension is equal to or less than one-quarter of the operational wavelength. Using plasmonic effects, the proposed sensor enhances the performance parameters of an ef...
Source: Plasmonics - April 13, 2024 Category: Biomedical Science Source Type: research
Dual Self-Referenced Refractive Index Sensor Utilizing Tamm Plasmons in Photonic Quasicrystal for Multistage Malaria Parasite Detection
In this study, we investigate the generation of optical Tamm modes and essential sensor features in dual-metal quasi-periodic photonic structures. Utilizing a Fibonacci sequence arrangement of SiO2 and Ta2O5 layers, the structures examined in this study include a central cavity designed for comprehensive analysis of blood samples. Through theoretical analysis, we observed three reflection minima in the photonic bandgap, with one being insensitive to refractive index fluctuations in blood samples. This observation forms the basis for a dual self-referencing refractive index sensor. Our study spans parasitic stages in malari...
Source: Plasmonics - April 13, 2024 Category: Biomedical Science Source Type: research
Design and Analysis of Plasmonic Solar Absorber for Visible and Infrared Spectrum
In conclusion, the designed SBNA h olds significant potential for diverse applications such as energy harvesting, optical emission, and thermal photonics. (Source: Plasmonics)
Source: Plasmonics - April 13, 2024 Category: Biomedical Science Source Type: research
Correction to: Numerical Investigations of SPPs at Chiroferrite ‑Metal Interface
(Source: Plasmonics)
Source: Plasmonics - April 13, 2024 Category: Biomedical Science Source Type: research
Biosynthesis of Ag-Doped CuO Nanoparticles Using Heracleum persicum Extract for Enhanced Antibacterial and Photocatalytic Dye Degradation Properties
This study presents the synthesis of copper oxide nanoparticles doped with silver nanoparticles utilizingHeracleum persicum (H. persicum) extract (CuO-Ag@H. persicum). Characterization techniques including XRD, FT-IR, SEM, and TEM confirmed the successful synthesis of homogeneous CuO-Ag@H. persicum nanoparticles without impurities, exhibiting a spherical morphology with sizes ranging from 35 to 65 nm. The incorporation of silver nanoparticles on the surface of the copper oxide introduces unique optical properties, notably the surface plasmon resonance (SPR) phenomenon, enhancing photocatalytic activity. Under UV and sunlig...
Source: Plasmonics - April 12, 2024 Category: Biomedical Science Source Type: research
Polarization Selective PCF-Based Plasmonic Biosensor for Multi-Analyte Detection
AbstractThe proposed miniaturized biosensor, the dual-channel multi-analyte single polarization (DCSP) photonic crystal fiber (PCF) sensor, offers real-time measuring and high sensitivity, making it a promising candidate for future sensing devices. It was structured using the stack-and-draw technique to show the sensor practical feasibility. The DCSP PCF sensor offers maximum wavelength and amplitude sensitivities of 11,000 nm/RIU and 807 RIU−1, respectively in both channels for the analyte refractive index (RI) ofna = 1.33 to 1.41. This DCSP PCF sensor has a birefringence of 11.2\(\times {10}^{-4}\). The use of DC...
Source: Plasmonics - April 12, 2024 Category: Biomedical Science Source Type: research
Optimization of Graphene-Based Square Slotted Surface Plasmon Resonance Refractive Index Biosensor for Accurate Detection of Pregnancy
AbstractThis paper presents a biosensor proposed for pregnancy detection leveraging on the refractive indices of urine. A refractive index is a parameter that is affected by the fluctuation of hormones during pregnancy. We apply simulations performed with COMSOL Multiphysics to develop the biosensor for pregnancy detection. The proposed sensor demonstrates an optimum sensitivity of 2000 GHzRIU−1. This is a clear indication that this technique can be successfully used on all ranges of analyte concentrations. Besides this, the sensor has a low figure of merit (FOM) value of 4.225 RIU−1. This excellent performance paramet...
Source: Plasmonics - April 11, 2024 Category: Biomedical Science Source Type: research
