Design of Graphene-Coated Silver Nanoparticle Based on Numerical Solution to Enhance the Absorption of the Thin-Film Solar Cell
In this study, we designed a graphene-coated silver nanoparticle (GCSNP) for this purpose. We modeled its permittivity using the Kubo formula and an equivalent dielectric permittivity model. Our nanoparticle size was deliberately chosen to be significantly smaller than the resonance wavelength, allowing it to be treated as an isotropic homogeneous particle. The inherent plasmonic properties of nanoparticles can enhance the efficiency of photovoltaic cells by increasing their scattering cross-section. We computed the scattering cross-section of GCSNP through numerical solutions and optical simulations for graphene thickness...
Source: Plasmonics - February 14, 2024 Category: Biomedical Science Source Type: research
Investigation of Structural, Morphological, and Optical Properties of Fe and Co/Fe Dual-Doping Zn2SnO4 Nanoparticles Synthesized by Hydrothermal Method for Biomedical Application
AbstractZinc stannate (ZTO) has garnered a lot of attention lately for use in biological applications because it is non-toxic and biocompatible. A hydrothermal process was used to synthesize pure ZTO, ZTO doped with Fe, and ZTO: Co/Fe co-doping for 20 h at 200 °C. Every sample has a spinel-type arrangement, according to XRD patterns. An FE-SEM image revealed the spherical morphology. Transmittance of all samples was measured by using an ultraviolet–visible spectrophotometer. Their energy gaps were 3.72, 3.6, 3.0, 3.3, and 3.7 eV for pure, ZTO: Fe dopin g with concentrations of 1, 3, and 5% and 1%Co/3%Fe co-doping ZTO, r...
Source: Plasmonics - February 13, 2024 Category: Biomedical Science Source Type: research
Evaluation and Analyzing the Linear Optical Properties of Polymer/Al-Ag-ZnO Nanocomposites
AbstractThe manuscript explores the effects of incorporating inorganic –organic nanoparticles into the matrices of polystyrene, poly (methyl methacrylate), and polyvinyl alcohol on their linear optical properties. Transmission electron microscopy technique (TEM) is used for analyzing the morphology of aluminum (Al), silver (Ag), and zinc oxide (ZnO) nanoparticles. Th e chemical composition of the samples was analyzed using Fourier transform infrared spectroscopy (FTIR), while their optical properties were evaluated using UV–Vis spectroscopy. The synthesis of nanoparticles exhibits a clear spherical morphology. The refl...
Source: Plasmonics - February 13, 2024 Category: Biomedical Science Source Type: research
Optimizing Chemical Sensing Performance: A New Terahertz Waveguide Plasmonic Sensor with Hybrid Refractive Index Integration
This article proposes photonic crystal fiber (PCF) with a square hollow-core sensor for detecting chemical substances effectively. COMSOL Multiphysics software is employed to investigate mentoring and detecting characteristics of the sensor using a finite element method (FEM) implementation. Rectangular air holes are used to reduce fabrication complexity. The suggested fiber is numerically examined in terahertz (THz) frequency spectrum from 1.8 to 2.5 THz to obtain superior sensitivity while minimizing confinement loss. The simulation result of this sensor exhibits higher relative sensitivity including benzene, ethanol, an...
Source: Plasmonics - February 12, 2024 Category: Biomedical Science Source Type: research
First Principal Calculations on the Electronic Structure and the Optical Properties of Al-doped Zigzag GaN Nanotube
AbstractIn this work, the electronic structures and the optical properties of Al-doped zigzag (10,0) GaN nanotubes are investigated using first-principles calculations. The examined structure of the GaN nanotube consists of 40 atoms (20 Ga and 20 N). The density functional theory (DFT) is carried out in the SIESTA package. The Gallium atoms were replaced by Al atoms according to the formula Ga1 −xAlxN at various Al rates (x = 0, 0.2, 0.4, 0.6, 0.8, and 1). The electronic structure calculation showed that zigzag gallium nitride nanotube is a direct band gap semiconductor. When more aluminum atoms were substituted for ...
Source: Plasmonics - February 12, 2024 Category: Biomedical Science Source Type: research
Au-MgF2-Coated Photonic Crystal Fiber Surface Plasmon Resonance Sensor with High FOM
AbstractA surface plasmon resonance (SPR) sensor composed of photonic crystal fibers (PCFs) is designed for refractive index (RI) sensing with a high figure of merit (FOM). The dual Au-MgF2 layer is covered on the double-side polished D-type PCF to stimulate SPR. Our numerical analysis reveals that the maximum wavelength sensitivity and amplitude sensitivity of the PCF-SPR sensor are 59,000 nm/RIU and 6076 RIU−1, respectively, in the RI range of 1.25 ~ 1.43. The maximum FOM is 2033 RIU−1 and the resolution is 1.69 × 10−6. The results provide guidance and insights into the design of PCF-SPR sensors with h...
Source: Plasmonics - February 12, 2024 Category: Biomedical Science Source Type: research
Tunable Cherenkov Terahertz Graphene Surface Plasmon Generation in Graphene Sheet by a Moving Relativistic Electron Beam
AbstractThe moving electron beam first excites the (Graphene surface plasmons) GSPs by phase matching, and then GSPs are transformed into radiation in dielectrics when meeting the Cherenkov radiation condition. A relativistic electron beam is passing over a graphene sheet deposited on a glass substrate, excites the tunable and coherent graphene surface plasmons (GSPs), and is transformed into terahertz radiation via Cherenkov interaction, whose frequencies lie in the THz regime. The interaction between electron beam and graphene plasmons takes place, when the beam velocity reaches to the phase velocity of the graphene surf...
Source: Plasmonics - February 11, 2024 Category: Biomedical Science Source Type: research
Genus Plasma-Based Self-Complementary Reconfigurable Intelligent Metasurfaces
AbstractThis paper investigates the radiation properties of plasma-based intelligent reflectarray surface (IRS) that utilizes self-complementary elements. The elements of the surface employ reconfigurable plasma conductivity to manipulate the polarization of electromagnetic waves in various Ka-band applications. The unit-cell of the IRS is composed of 2 × 2 sub-cells of 0.5 λo × 0.5 λo × 0.078 λo mm3. Each sub-cell contains three glass containers arranged in a triangle-rectangular-triangle configuration and filled with ionized plasma gas. When the IRS illuminated by a linearly polarized (LP) plane wave, ...
Source: Plasmonics - February 8, 2024 Category: Biomedical Science Source Type: research
Wave-Guided Surface Plasmonic Resonance Induced Giant and Tunable Photonic Spin Hall Effect with Polarization Mode Control
AbstractThe photonic spin Hall effect (PSHE) at the optical interface is a polarization-dependent phenomenon of incident light. The described methodology is a novel strategy for controlling the active polarization mode of the enhanced PSHE. The PSHE is enhanced for both horizontal (H) and vertical (V) polarized light in the\(\sim\) 1.5 mm to the submillimeter range. The enhanced PSHE has been measured for the reflected light from the modified Kretschmann configuration. An additional thin dielectric (glass) layer on the ultrathin metal (Ag, Al) layer provides simultaneous surface plasmon resonance (SPR) and wave-guiding eff...
Source: Plasmonics - February 7, 2024 Category: Biomedical Science Source Type: research
Controlling Plasmonic Field Enhancement via the Interference of Orthogonal Plasmonic Modes
AbstractOptical nanoantennas concentrate light into their local fields. The field concentration property is governed by the plasmonic resonances and their interference. Here, we present a method for controllable local-field interferences in the hot spot of nanorods and experimentally demonstrate that the field enhancement can be tuned in a wide range. For this, we design nanoparticles with given phase relations between their plasmonic eigenmodes and at the same time tune the phase between the components of the external field by changing its polarization state to achieve in-phase excitation of the plasmon modes. Strong-fiel...
Source: Plasmonics - February 6, 2024 Category: Biomedical Science Source Type: research
Hybridization of Electronic Bands for Extending Plasmonic Band by Alloyed Nanostructures
AbstractPlasmonic nanostructures have extensive applications in sensors and optoelectronic devices. Noble metals are the most suitable candidates for the construction of plasmons due to their high electrical conductivity and high plasmonic activities. However, silver is easy to get oxidized and is thus not suitable for plasmonic nanostructures with long-term stability. In contrast, gold is a most stable metal and more extensive employed in plasmon photonic structures. Nevertheless, plasmon band for gold starts from 2.38 eV to lower photon energies, ruling out the possible designs of plasmonic device in the blue spectrum. W...
Source: Plasmonics - February 6, 2024 Category: Biomedical Science Source Type: research
Coherent Control of Angular Interrogation of Sensitivity of the Surface Plasmon Polariton Waves at the Interface of Metal and Dielectric Medium
AbstractThe sensitivity of the surface plasmon polariton waves (SPPs) is theoretically investigated and modified at the interface of four-level dielectric medium and silver metal using angular interrogation. The angular interrogation of sensitivity of the SPPs with respect to refractive index is given as\(d\theta /dn_d\). A useful control in sensitivity with system and driving field parameters is reported. The sensitivity is oscillation function of probe field detuning and control fields Rabi frequency. The maximum and minimum sensitivities of SPPs are investigated to be 2000 deg/RIU and 150 deg/RIU with probe field detuni...
Source: Plasmonics - February 6, 2024 Category: Biomedical Science Source Type: research
Fano Resonance-Plasmonic Biosensors Based on Strong Coupling of Hybrid Plasmonic-Photonic Modes
AbstractSurface Plasmon Resonance (SPR) sensors are a useful tool for biomolecule detection, offering label-free and real-time monitoring characteristics. However, traditional SPR sensors still face the challenges of limited detection sensitivity, especially for sensing small molecules with a low concentration level (less than 1 pM (10−12 mol/L)). To overcome this challenge, in this paper, we designed a Kretschmann configuration which uses a plasmonic waveguide to generate a powerful Fano resonance through the coupling of the surface plasmon polariton (SPP) mode and photonic waveguide (PWG) mode at the sensing interfa...
Source: Plasmonics - February 6, 2024 Category: Biomedical Science Source Type: research
Mush-Room Structures –Loaded Coplanar Waveguide Spoof Surface Plasmon Polariton with Reduced Longitudinal Length
AbstractA new coplanar waveguide (CPW) spoof surface plasmon polariton (SSPP) transmission line (TL) with mushroom structures is proposed. The analyses of the equivalent circuit reveal that the proposed SSPP requires shorter longitudinal length and also more compact size occupation than the conventional unloaded SSPP TL for achieving the same asymptotic frequency. Besides, the dispersion curve of the proposed SSPP can be controlled flexibly without changing the transversal geometric dimensions. To illustrate the design principle, a SSPP TL is designed, fabricated, and tested. It is validated that the utilization of mush-ro...
Source: Plasmonics - February 5, 2024 Category: Biomedical Science Source Type: research
Tuning the Nonlinear Optical Properties of Cu2SnS3 Nanoparticles Using Alkali Tomes Doping
In this study, rubidium (Rb), cesium (Cs), and sodium (Na) alkali materials doped into CTS (Cu2SnS3), which is frequently used in semiconductor technology, were prepared to synthesize via ball milling method. CTS and Rb-, Cs, and Na-doped target crystal structures were recorded via XRD, and the surface images were monitored by SEM. Used raw solid powder materials were purchased and prepared to form targets in a laboratory environment, and the generated targets were placed in glass vessel to produce nanoparticles in ethanol using femtosecond laser ablation technique. In the SEM images of CTS, it was seen that the average na...
Source: Plasmonics - February 2, 2024 Category: Biomedical Science Source Type: research
