Temperature-Controlled and Adjustable Terahertz Device Based on Vanadium Dioxide DOI Open Access

Wenqiang Lu,

Hao Sun,

Wenjing Xuan

et al.

Coatings, Journal Year: 2024, Volume and Issue: 14(4), P. 478 - 478

Published: April 13, 2024

We propose a simple multifunctional terahertz absorber based on the simulation. The device consists of gold layer, SiO2 dielectric and VO2 top layer. modulation mechanism this is to utilize thermally induced phase transition characteristics vanadium dioxide material. simulation results show that when temperature 312 K, has effect complete reflection waves. When 345 almost perfect absorption wave in range 4.7–9.7 THz, spectral absorptivity modulated 0~0.999. electric field conditions at different temperatures were plotted further explain reasons for performance device. was explained using impedance matching theory. In addition, influence structural parameters rate studied, providing reference practical applications. At same time, polarization-insensitive insensitive incident angle. angle changes from 0°to 45°, still stable effect. great application prospects stealth, modulation, other fields provides ideas design related devices.

Language: Английский

Using Planar Metamaterials to Design a Bidirectional Switching Functionality Absorber—An Ultra-Wideband Optical Absorber and Multi-Wavelength Resonant Absorber DOI Creative Commons
Shu‐Han Liao, Chih-Hsuan Wang,

Pei-Xiu Ke

et al.

Photonics, Journal Year: 2024, Volume and Issue: 11(3), P. 199 - 199

Published: Feb. 23, 2024

This study aimed to investigate a bidirectional switching functionality absorber, which exhibited an ultra-wideband characteristic in one direction, while the other direction it demonstrated absorption of three different resonant wavelengths (frequencies). The fully layered planar structure absorber consisted Al2O3, Zr, yttria-stabilized zirconia (YSZ), YSZ, Al, and Al. simulations were conducted using COMSOL Multiphysics® simulation software (version 6.1) for analyses, this introduced pivotal innovations. Firstly, there had been scarce exploration YSZ Zr as materials designing absorbers. uses context relatively uncharted territory, our research endeavored showcase their distinctive performance materials. Secondly, development with multifunctional characteristics was rarity existing literature. encompassed integrations optical creation multi-wavelength featuring wavelengths. design such holds promise diverse applications detection communication systems, presenting novel possibilities related fields. Lastly, notable discovery demonstrated: discernible redshift phenomenon peaks when thickness serving material layer, increased.

Language: Английский

Citations

3
Tunable High-Sensitivity Four-Frequency Refractive Index Sensor Based on Graphene Metamaterial DOI Creative Commons

Xu Bao,

Shujun Yu,

Wenqiang Lu

et al.

Sensors, Journal Year: 2024, Volume and Issue: 24(8), P. 2658 - 2658

Published: April 22, 2024

As graphene-related technology advances, the benefits of graphene metamaterials become more apparent. In this study, a surface-isolated exciton-based absorber is built by running relevant simulations on graphene, which can achieve than 98% perfect absorption at multiple frequencies in MWIR (MediumWavelength Infra-Red (MWIR) band as compared to typical absorber. The consists three layers: bottom layer gold, middle dielectric, and top patterned with graphene. Tunability was achieved electrically altering graphene’s Fermi energy, hence position peak. influence relaxation time sensor discussed. Due symmetry its structure, different angles light source incidence have little effect rate, leading polarization insensitivity, especially for TE waves, has insensitivity ultra-wide-angle degrees. characterized tunability, polarisation high sensitivity, sensitivity up 21.60 THz/refractive index unit (RIU). This paper demonstrates feasibility multi-frequency provides theoretical basis realization sensor. makes it possible apply high-sensitivity sensors.

Language: Английский

Citations

2
Tellurium Photonic Crystal-Based Terahertz Polarization Splitter Using a Diamond-Shaped Ferrite Pillar Array DOI Creative Commons
Haiping Zhang, Zhifeng Zeng, Yong Wang

et al.

Crystals, Journal Year: 2024, Volume and Issue: 14(12), P. 1015 - 1015

Published: Nov. 23, 2024

A T-shaped photonic crystal waveguide was designed with square lattice tellurium crystals. diamond-shaped ferrite pillar array inserted in the junction of to make a novel terahertz polarization splitter. Both transverse electric and magnetic modes were numerically investigated by plane wave expansion method, which used complete band gaps covering from 0.138 THz 0.144 THz. In this frequency domain fully polarized gaps, transmission efficiency up −0.21 dB −1.67 for modes, respectively. Under action DC field, waves rotated 90 degrees array. Transverse or can be separated isolator (six smaller rods) fixed waves. The characteristics splitter analyzed finite element its optimized 95 percent fine-tuning radii thirteen pillars. future integrated communication network sky–earth–space will require devices millimeter wavebands. envisaged has unique function provides promising method realization 6G devices.

Language: Английский

Citations

1
Temperature-Controlled and Adjustable Terahertz Device Based on Vanadium Dioxide DOI Open Access

Wenqiang Lu,

Hao Sun,

Wenjing Xuan

et al.

Coatings, Journal Year: 2024, Volume and Issue: 14(4), P. 478 - 478

Published: April 13, 2024

We propose a simple multifunctional terahertz absorber based on the simulation. The device consists of gold layer, SiO2 dielectric and VO2 top layer. modulation mechanism this is to utilize thermally induced phase transition characteristics vanadium dioxide material. simulation results show that when temperature 312 K, has effect complete reflection waves. When 345 almost perfect absorption wave in range 4.7–9.7 THz, spectral absorptivity modulated 0~0.999. electric field conditions at different temperatures were plotted further explain reasons for performance device. was explained using impedance matching theory. In addition, influence structural parameters rate studied, providing reference practical applications. At same time, polarization-insensitive insensitive incident angle. angle changes from 0°to 45°, still stable effect. great application prospects stealth, modulation, other fields provides ideas design related devices.

Language: Английский

Citations

0