Actively Tunable Plasmon-Induced Transparency via Alternately Coupled Resonators Based on Bulk Dirac Semimetal Metamaterials
AbstractWe study the plasmon-induced transparency (PIT) effect in the terahertz domain based on bulk Dirac semimetal (BDS) metamaterials constructed from a cut-wire and a C-shaped resonator pair. With the help of numerical simulations and coupled mode theory, we find that the depth of the transparent window can be adjusted by the coupling distance between the cut-wire and the C-shaped resonator pair. It is further shown that by changing the Fermi level of BDS, the PIT effect can be dynamically tuned without reconstructing the geometry. Simultaneously, the metamaterial structure has excellent sensing properties, which contr...
Source: Plasmonics - January 27, 2024 Category: Biomedical Science Source Type: research

Comparing the Effect of Low-Temperature Plasma on Cleaning and Polishing Coins with a Chemical Method and the Reversed Effect on the Plasma Properties
This study focused on working the device as a DC glow discharge argon plasma device by a positive electrode made of a copper rod. The Paschen curve was measured at different distances between the cathode and the anode (4, 6, 8, 10, and 12 cm). From these results, the operating conditions of argon gas pressure and voltage that will produce plasma at each distance were determined. The investigated pressures were\(1 \times {10 }^{-1}\) and\(2 \times {10 }^{-1}\) mbar, while the operating voltage ranged from 110 to 160 V. The generated plasma was used to clean and polish the surface of two Egyptian fifty-piaster coins (still i...
Source: Plasmonics - January 26, 2024 Category: Biomedical Science Source Type: research

Plasmonic Ring Resonator Sensor with High Figure of Merit and Sensitivity Using Degenerate N-Doped Silicon for SPP Excitation
We present the modeling and numerical analysis of a highly sensitive plasmonic nano-ring resonator based on a degenerate n-doped silicon waveguide for bulk and adlayer sensing applications using the finite element method. The figure of merit of the sensor has been greatly improved without compromising the sensitivity value through careful optimization of the opto-geometric parameters to promote field confinement in the sensing region. To overcome the optical losses associated with conventional plasmonic devices, instead of metal, a degenerate n-silicon is used as a plasmonic material in this sensor. Additionally, it render...
Source: Plasmonics - January 25, 2024 Category: Biomedical Science Source Type: research

Supersensitive Detection of Vibrio Cholera Using Novel Graphene-based Optical Device Based on a Surface Plasmon Resonance Structure
AbstractVibrio cholera (V.C.) is currently one of the most hazardous bacteria since it can lead to hepatitis, diarrhea, vomiting, and typhoid. The various methodologies include time-consuming steps that take several hours before the test report is accessible. Therefore, creating a quick and reliable technique to identify V.C. is essential. The detection of V.C. is proposed in this study using a unique bio-photonic detector that employs Surface Plasmon Resonance (SPR) structure and layers of silver (Ag), silicon (Si), and graphene (G). The reflectance spectrum properties are inspected by the transfer matrix technique. To op...
Source: Plasmonics - January 25, 2024 Category: Biomedical Science Source Type: research

ARF Dual-Channel Magnetic Field and Temperature Sensor Based on the SPR Effect
AbstractAn anti-resonant fiber (ARF) surface plasmon resonance (SPR) dual-parameter sensor is designed for simultaneous detection of the magnetic field and temperature. Both sides of the fiber core in the sensor are filled with gold nanowires and gold dielectrics, respectively, to excite SPR. The center air hole in the ARF is filled with a magnetic fluid (MF) which responds to the magnetic field and temperature, and the temperature measurement is carried out by putting polydimethylsiloxane (PDMS) outside the gold nanowires. Analysis by the finite element method reveals maximum first and second resonance peak sensitivities ...
Source: Plasmonics - January 24, 2024 Category: Biomedical Science Source Type: research

Terahertz Square Core Photonic Crystal Fiber Sensor: Revolutionizing Efficient Blood Cell Detection Through Refractive Index Sensing Based on Surface-Enhanced Spectroscopic Properties
This article recommends a photonic crystal fiber (PCF) with a square hollow core sensor for detecting blood cells effectively. To achieve improved relative sensitivity with low confinement loss (CL), the suggested PCF has been explored in the terahertz (THz) band from 2.0 to 4.0 THz. The Full-Vectorial Finite Element Method (FV-FEM) is used to solve the electromagnetic formula and perform numerical computations on the structure in the THz frequency range domain. At optimal frequencyf = 3.2 THz, considerable variations in the relative sensitivity of 91.38%, 92.25%, 93.20%, and 95.48% for glucose, plasma, white blood cel...
Source: Plasmonics - January 20, 2024 Category: Biomedical Science Source Type: research

Wearable Full-Textile Spoof Surface Plasmon Polariton Transmission Line for Secured Communication in Wireless Body Area Network
AbstractIn this article, a wearable full-textile spoof surface plasmon polariton transmission line (SSPP TL) with improved communication data security has been presented. Equivalent circuit analyses reveal that the new proposed SSPP TL based on the patch-loading technique achieves flexible dispersion control by changing the patch dimension. As compared to conventional SSPP TL with periodical corrugations, the proposed wearable SSPP TL has similar transmission performance, but with a 43% reduction in transversal width. Such results are beneficial to the size reduction of the wearable wireless body area network (WBAN) system...
Source: Plasmonics - January 19, 2024 Category: Biomedical Science Source Type: research

Photonic Crystal –Based Nanoscale Multipurpose Biosensor for Detection of Brain Tumours, HIV, and Anaemia with High Sensitivity
AbstractA nanoscale-based 2D-photonic crystal (PhC) biosensor with silicon rods arranged in a triangular lattice structure is proposed in this work. The unique characteristic of the proposed structure is the design of dual nanocavity where two different rod radii are used within the ring resonator. The plane-wave expansion (PWE) method is used to analyse photonic band gaps (PBGs) and the sensing parameters are analysed using finite difference time domain (FDTD) techniques. The proposed biosensor is aimed at detecting the brain tissues, human immune deficiency virus (HIV) –infected blood samples, and sickle cell anaemia. ...
Source: Plasmonics - January 19, 2024 Category: Biomedical Science Source Type: research

Magnesium Oxide and Silicon-Assisted Surface Plasmon Resonance Sensor for Gas Detection: A Performance Analysis
AbstractThe surface plasmon resonance (SPR) sensor with better sensitivity and gas detection capabilities is reported in this paper. It is based on a hybrid layer of silver (Ag)/magnesium oxide (MgO)/silicon (Si). For numerical analysis, the finite element technique (FEM) was employed. The attenuated total reflection (ATR) approach has been used for diagnosing various types of hazardous gas. The increase in the refractive index of various hazardous gases, ranging from 1.327 to 1.38 for four different types of gas, caused the resonance angle to shift. The obtained sensitivities were 86.12  deg/RIU, 164.54 deg/RIU, 199.59Â...
Source: Plasmonics - January 18, 2024 Category: Biomedical Science Source Type: research

Dual Polarized High Sensitivity Photonic Crystal Fiber Surface Plasmon Resonance Sensor Coated with Indium Tin Oxide
AbstractIn this paper, we present a tetragonal cluster-based photonic crystal fiber (PCF) surface plasmon resonance (SPR) sensor with high wavelength sensitivity (WS). Indium tin oxide (ITO), as a dielectric material with adjustable photoelectric properties and low loss in the infrared range, is used in this sensor. The central rectangular air hole is used to construct an asymmetric structure which enables the sensor work in y and x polarization. We optimized the structural parameters of the sensor and the result shows that the sensor has high WS of 31,500  nm/RIU and 31,000 nm/RIU, wavelength resolution of 3.17 × 1...
Source: Plasmonics - January 18, 2024 Category: Biomedical Science Source Type: research

The Multipolar Contribution and Plasmon Hybridization in Core –Shell Clusters
AbstractCore –shell structures exhibit excellent versatility, tunability, and stability due to the different material compositions. Here, we synthesized the core–shell structure (SiO2@Au) by sol –gel method and measured the scattering spectra of its monomer, dimer, and trimer by dark field technique. Meanwhile, the contribution of multipole moments to the scattering cross-section is discussed by Mie theory. The simulated total scattering cross-section mainly contributed by electric dipole moments is in good agreement with the experimental spectra. We also found that the inner surface charge of gold shells changes sig...
Source: Plasmonics - January 17, 2024 Category: Biomedical Science Source Type: research

Geometrical Optimization of TiO2-Noble Metal Grating for Enhanced Photocatalytic Activity and SPR Biosensor Application
This study contributes valuable insights into the design of TiO2-noble metal gratings for organic pollutant degradation and biosensor applications. (Source: Plasmonics)
Source: Plasmonics - January 17, 2024 Category: Biomedical Science Source Type: research

Dual-Side Polished Surface Plasmon Resonance –Based Photonic Crystal Fiber for Refractive Index Sensing and Polarization Filtering
AbstractA surface plasmon resonance (SPR) biosensor based on dual-side polished photonic crystal fiber (PCF) has been presented in this paper. An external gold (Au) coating was used as a plasmonic material to detect changes in an analyte refractive index (RI). Sensor ’s structural parameters were optimized for better performance. The proposed sensor’s simulation was conducted using the finite element method (FEM). Analytes within the RI range of 1.30 to 1.40 were used to develop a sensor. The numerical results are expected to have a wavelength sensitivity (W S) of 9400 nm/RIU and amplitude sensitivity (AS) of 27.27 RI...
Source: Plasmonics - January 17, 2024 Category: Biomedical Science Source Type: research

Metal –Semiconductor-Metal Structure Enhanced Quantum Dot Infrared Photodetector for Near-Infrared
In this study, we introduce the MSM structure to the conventional QDIP and design a bespoke metal grating structure for it. This enhanced QDIP markedly boosts the absorptance of incide nt light in the near-infrared (NIR) region. Simulations using COMSOL software reveal that the conventional QDIP demonstrates an absorption peak of 46.11% at 351 THz. In contrast, the enhanced QDIP displays absorption peaks of 99.23%, 99.19%, 97.01%, and 89.23% at frequencies of 137 THz, 217 THz, 294 THz, and 367 THz, respectively. The maximum absorptance of the enhanced QDIP reaches 99.23%, which is 2.15 times greater than that of the conven...
Source: Plasmonics - January 17, 2024 Category: Biomedical Science Source Type: research

Plasmonic Metal-Insulator-Metal (MIM) Refractive Index Sensor for Glucose Level Monitoring
AbstractIn this article, we introduce a novel H-shaped plasmonic refractive index (RI) sensor coupled with a bus waveguide. The sensor is designed to interact with a straight metal-insulator-metal (MIM) waveguide configuration. To analyze the proposed structure, the finite element method (FEM) is employed, allowing for a comprehensive numerical investigation. The primary function of this sensor is to detect changes in RI by monitoring alterations in the resonant wavelength. The sensing mechanism involves the interaction of light with the plasmonic structure, and any variations in the RI of the surrounding medium induce cha...
Source: Plasmonics - January 17, 2024 Category: Biomedical Science Source Type: research