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
Enhancement in the Performance of a-Si:H Thin-Film Solar Cells by Light Trapping from Plasmonic Back Reflector
AbstractLight trapping is a very essential part of thin-film solar cells to improve their performance and make them comparable to the conventional c-Si solar cells. In this paper, we report the efficiency enhancement of 50% in hydrogenated amorphous silicon (a-Si:H) thin-film solar cells by light trapping from silver nanoparticles incorporated as plasmonic back reflector. Ag NPs are grown by the solid-state dewetting process on the different substrate configurations. Strong light scattering from Ag NPs as plasmonic back reflector configuration results in enhancement of diffused reflectance and haze in reflection throughout...
Source: Plasmonics - January 15, 2024 Category: Biomedical Science Source Type: research
Correction to: Light Plasmon Coupling in Planar Chiroplasma –Graphene Waveguides
(Source: Plasmonics)
Source: Plasmonics - January 15, 2024 Category: Biomedical Science Source Type: research
Design and Numerical Analysis of a PCF-SPR Sensor for Early-stage Malaria Detection
AbstractThis paper presents a photonic crystal fiber (PCF)-based surface plasmon resonance (SPR) sensor designed to achieve precise malaria detection in blood samples. The sensor ’s innovative architecture incorporates carefully optimized layers of plasmonic materials, including gold and TiO2, to attain sensitivity and specificity. Extensive assessment of this sensor ’s performance has been carried out through rigorous finite element analysis using COMSOL Multiphysics v5.6. The sensor’s configuration features a gold-coated PCF with a thin analyte layer, enabling the external detection of malaria parasites within bloo...
Source: Plasmonics - January 13, 2024 Category: Biomedical Science Source Type: research
Enhanced Characteristics of Iron Oxide Nanoparticles for Efficient Pollutant Degradation via Pulsed Laser Ablation in Liquid
This study focuses on the preparation, properties, and application of iron oxide nanoparticles (IONPs) synthesized through PLAIL for methylene blue (MB) dye degradation processes and the antibacterial activity of the prepared nanoparticles against Gram-positive:Staphylococcus aureus. The PLAIL method enables the production of tunable iron oxide nanoparticles (IONPs) with controlled size, morphology, and surface properties. The experimental setup, synthesis procedure, characterization techniques, photo-catalytic performance, and antibacterial activity are discussed. The results highlight the significance of PLAIL-synthesize...
Source: Plasmonics - January 13, 2024 Category: Biomedical Science Source Type: research
On the Plasmonic Properties of a Bi-Metallic Eccentric Ring-Disk Nanostructure
AbstractThis work reports on the plasmonic properties of an eccentric nanostructure consisting of a silver ring and a gold disk, in the frequency regime of several hundreds of tetrahertz. In the structure, a gold nanodisk is located in a silver nanoring, with the centers of the two metals being set apart. As the radius of the gold disk, the separation between the centers, the light polarization, and the refractive index of the surrounding dielectric material are respectively varied, the normalized scattering cross section of the system is numerically simulated, using the finite difference time domain method. Multiple plasm...
Source: Plasmonics - January 10, 2024 Category: Biomedical Science Source Type: research
Polarization Properties in AlGaN/GaN HEMT-Array with a Shifted Gate
We describe the plasmon resonances of AlGaN/GaN HEMT-array with a shifted gate at THz frequencies. By altering gate voltage and gate length, we obtained absorption spectra at different gate positions using the Drude dispersion to model the conductive channel layer. We observed that the asymmetry of the device ’s gate position has no effect on the first-order mode of absorption but significantly impacts the second-order or higher-order modes. Through the electric field distribution, it can be found that in the first-order mode, different gate positions do not affect the electric field distribution. But in higher-order mod...
Source: Plasmonics - January 10, 2024 Category: Biomedical Science Source Type: research
Bionic Metamaterial Microwave Blackbody with Temperature Insensitivity for C  ~ Ku Bands
AbstractDesigning microwave absorbers with broadband perfect absorption at high temperatures remains a challenge for researchers due to the variability of material properties with temperature. Herein, inspired by the absorption model ofPapilio blumei, this work establishes a method to realize broadband metamaterial microwave blackbody using polymer ceramics and bionic metamaterial structures. The size of the high-temperature resistive film and biomimetic hole of the bionic metamaterial microwave absorber (MMA) is optimized based on the trust region framework method. The absorption rate of the MMA reached 99% across the C â...
Source: Plasmonics - January 9, 2024 Category: Biomedical Science Source Type: research
Investigation of a Plasmonic Optical Sensor for Acetone Detection in Exhaled Breath and Exhaled Breath Condensate
AbstractWe propose a numerical investigation of a sensor for acetone monitoring in exhaled breath and exhaled breath condensate (EBC) using the surface plasmon resonance principle. For the theoretical analysis, we use the Kretschmann-Raether (K-R) setup and the Fresnel multilayer model. Four figures of merit, i.e., resonance angle (RA), minimum reflectance at resonance (MRR), full width at half maximum (FWHM), and sensitivity, are used for performance assessments. As the first step, we evaluate the performance of the sensor for various plasmonic metals and substrates. Results for emulations of exhaled breath indicated poly...
Source: Plasmonics - January 8, 2024 Category: Biomedical Science Source Type: research
Excitation of Surface Plasmon Polaritons (SPPs) at Uniaxial Chiral-Graphene Planar Structure
AbstractGraphene has garnered significant interest since its discovery. In graphene, surface plasmon polaritons (SPPs) are excited at frequencies ranging from mid-infrared to terahertz, which is not possible with traditional plasmonic materials. In this manuscript, numerical analysis of SPPs at uniaxial chiral-graphene planar structure is delineated. The surface conductivity of monolayer graphene is modeled by Kubo formulism. The dispersion relation is obtained analytically by applying impedance boundary conditions on the tangential field components. Extended electromagnetic theory is utilized to solve the analytical probl...
Source: Plasmonics - January 6, 2024 Category: Biomedical Science Source Type: research
Polarization-Insensitive Ultra-wideband Metamaterial Absorber for C- and X-bands
AbstractThis paper presents the design and analysis of a metamaterial-based wideband microwave absorber in the C- and X-band, comprised of lumped resistors, having thicknesses of the order of 0.05 λ mm. The structure was micro-machined on the FR-4 sheet in a periodically arranged array of 15 × 15 unit cells. These unit cells have a dimension of 12 × 12 mm each. The proposed absorber design presents excellent broadband absorption characteristics with relative bandwidth (RBW) of 85. 05% covering a bandwidth of 8.02 GHz ranging from 5.42 to 13.44 GHz. The absorption mechanism has been explained with the help of ...
Source: Plasmonics - January 4, 2024 Category: Biomedical Science Source Type: research
A Tamm Plasmon Refractive Index Sensor for Cancer Cell Detection Based on TiN and Semi-Porous Si3N4 Distributed Bragg Reflector
AbstractIn this article, a theoretical study of Tamm plasmon based Refractive Index (RI) sensor for cancer cell detection has been proposed. The proposed sensor structure comprises of a thin titanium nitride (TiN) layer of thickness (dm = 30 nm) followed by a liquid cell of thickness (dL = 1500 nm) then followed by 16 pairs of semi-porous DBR (spDBR). The high and low index layers of spDBR constitute of silicon nitride (Si3N4) and porous Si3N4, respectively. We considered the porosity of low-index layer as 75%. The existence of Tamm plasmon between TiN and spDBR interface and the effect of porosity on the photoni...
Source: Plasmonics - January 4, 2024 Category: Biomedical Science Source Type: research
Simulation of Highly Sensitive Multi-Core-Satellite Plasmonic Structures for Detection of Gastric Cancer Agent MicroRNA-21 Using Modified Discrete Dipole Approximation
AbstractUsing the modified discrete dipole approximation (DDA) method, the absorption spectrum of the multi-core-satellite structures (which are formed by connecting plasmonic nanoparticles by two probe molecules and one microRNA-21 molecule) was investigated. Two spherical and chain models were considered for the connection of the plasmonic nanoparticles. The results showed that using the chain connection model of nanoparticles leads to the formation of multiple absorption peaks, which we classified in the three wavelength regions, the short, the middle, and the long region. The three regions was 350 to 500 nm, 500 to 650...
Source: Plasmonics - January 3, 2024 Category: Biomedical Science Source Type: research
Green Synthesis and Characterization of Silver Nanoparticles Using Echium amoenum Fisch. & amp;C.A.Mey. Extract: Colorimetric Assay and Nonlinear Optical Absorption
In this study, silver nanoparticles have been synthesized using green synthesis fromEchium amoenum Fisch.&C.A.Mey. extract. The extract of this flower was used to reduction of silver nitrate solution and stabilization of formed silver nanoparticles. The extract of this flower contains different anthocyanin compounds, polyphenols, and vegetable stearic fatty acids that can contribute in reduction and stabilization of silver nanoparticles. Characterization of the nanoparticles was performed using X-ray diffraction method (XRD), dynamic light scattering (DLS), UV –Visible spectrum, and open aperture Z-scan method. The m...
Source: Plasmonics - January 3, 2024 Category: Biomedical Science Source Type: research
