Metamaterial-Based Sensors Loaded Corona-Shaped Resonator for COVID-19 Detection by Using Microwave Techniques
AbstractThe paper proposes microwave-based metamaterial-based sensors for coronavirus infection detection. A sensor has been developed to calculate the electromagnetic wave ’s coefficients of transmission (S21) and reflection (S11) at resonance frequency. The computer simulation technology (CST) tools have been used to create the system and evaluate its consequences. The sensor uses electromagnetic interaction with a blood sample from a person who has COVID-19. This is done by watching for an alteration in the resonant frequency, which serves as a sign of COVID-19. Infectious people’s blood samples indicated a 740-MHz ...
Source: Plasmonics - August 30, 2023 Category: Biomedical Science Source Type: research
High-Efficiency Photodetectors Based on Zinc Oxide Nanostructures on Porous Silicon Grown by Pulsed Laser Deposition
In this study deposited zinc oxide (ZnO) nanostructures were prepared by pulsed laser deposition (PLD) technique on porous silicon (PS) substrates that were prepared via photoelectrochemical etching of silicon n-type (100). The study investigated the influence of laser energy on various characteristics of the fabricated devices, including their optical, morphological, structural, electrical, and photodetector features. The X-ray diffraction results indicate a dominant broad diffraction peak at 69.14 °, and the ZnO phase aligns with the hexagonal wurtzite structure. The field emission scanning electron microscopy micrograp...
Source: Plasmonics - August 30, 2023 Category: Biomedical Science Source Type: research
Fano Resonance Based on Coupling Between Nanoring Resonator and MIM Waveguide for Refractive Index Sensor
AbstractFano resonance is a sharp and asymmetric spectral feature that can be used for refractive index sensing. In this paper, we propose a Fano resonance sensor based on the coupling between a nanoring resonator and a metal-insulator-metal (MIM) waveguide. The nanoring resonator is fabricated in the middle of the MIM waveguide, and the two structures are coupled with high-field confinement. The transmission spectrum of the coupled structure shows a Fano resonance, which is sensitive to the refractive index of the surrounding medium. The sensitivity of the sensor is estimated to be 1700 nm/RIU, which is comparable to the ...
Source: Plasmonics - August 30, 2023 Category: Biomedical Science Source Type: research
Characteristic Reflection Peak and Its Origin of Nanostructured Material Containing Small Metal Nanoparticles: Two Case Studies
AbstractTo better understand and utilize the optical reflection behaviors of the nanostructured materials containing small metal nanoparticles (NPs), we once proposed a hypothesis that the recorded characteristic reflection peak should originate from the competition between the localized surface plasmon resonance (LSPR) scattering and absorption of metal NPs. To prove our hypothesis, the Ag- and Au-ion-implanted samples are prepared again by separately introducing 30 keV Ag and Au ions into 0.5-mm-thick SiO2 wafers to a fluence of 6 × 1016 ions/cm2. Especially, the Au-ion-implanted sample is further annealed in flo...
Source: Plasmonics - August 29, 2023 Category: Biomedical Science Source Type: research
Investigations On Device Structure and Sensing Mechanism Using Gold Nanoparticles Decorated Photonic Crystal Fiber-based Biosensors
AbstractA modified photonic crystal fiber (PCF) was utilized as a biosensor, incorporating gold nanoparticles as an active plasmonic material. The finite element method (FEM) was employed to compute numerical interpretations of sensing performance using various liquids: liver blood, colon blood, human plasma, water, and pentanol. In the proposed biosensor configuration, the test sample (analyte) was placed within the core, surrounded by cladding air holes, and external to the hollow core fiber structure. Sensitivity calculations were conducted both before and after the addition of the gold overlayer. The maximum amplitude ...
Source: Plasmonics - August 29, 2023 Category: Biomedical Science Source Type: research
