Terahertz bands multifunctional metamaterial transmission-absorption switching device based on vanadium dioxide

Dalton Transactions, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

In this paper, a vanadium dioxide (VO2)-based terahertz device is proposed to realize the conversion between broadband absorption and transmission functions, including VO2 bottom layer, dielectric layer pattern in three-layer structure. With change of conductivity, metamaterial can switch transmission. When exhibits transmission, it has high transmittance 90% for waves 5.6 THz 8.7 frequency band. absorption, 3.66 9.98 Furthermore, with increasing peak decreases from 93.8% 0% increases 1% 99.5%. The impedance matching theory invoked physical mechanism elucidated by analyzing surface electric field device. By studying characteristics different incidence polarization angles, insensitive good performance over large angles. Compared other absorbers metamaterials, structure study unique design diverse functions play an important role various fields such as communications, electromagnetic stealth, sensors, thermal emission devices.

Language: Английский

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Tunable perfect meta-absorber with high sensitivity for refractive index sensing application

Sensing and Bio-Sensing Research, Journal Year: 2024, Volume and Issue: 45, P. 100676 - 100676

Published: July 27, 2024

An infrared (IR) tunable perfect meta-absorber (TPM) is presented, which configured of metal-insulator-metal (MIM) structure. The unit cell the TPM device composed two opposite T-shaped and rod-shaped Au resonators on reflective mirror layer. optimized feature size can achieve absorption resonant wavelength be tuned from blue-shift first then red-shift by increasing gap between continuously. tuning process red shift linear. By changing distance resonators, exhibits linearly. Moreover, shows polarization-dependent characteristic that main resonance attenuated 100% to 0% polarization angle 0° 90° incident IR light. has an excellent linear relationship with ambient refractive index, sensitivity maximum figure merit (FOM) are calculated as 1249 nm/RIU 21 RIU−1, respectively. These results prove design proposed very suitable for use sensing, switching, index sensing applications.

Language: Английский

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Broadband polarization conversion metasurface for beam deflection with switchable characteristics

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

A broadband polarization conversion metasurface (PCM) for anomalous reflection and beam deflection with switchable characteristics.

Language: Английский

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Stretchable kirigami mechanical metamaterial with tunable dual electromagnetically induced transparency resonances

Applied Materials Today, Journal Year: 2024, Volume and Issue: 41, P. 102455 - 102455

Published: Oct. 5, 2024

Language: Английский

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Tunable terahertz metamaterial with single to triple modulation resonance characteristics

Materials Science and Engineering B, Journal Year: 2025, Volume and Issue: 315, P. 118128 - 118128

Published: Feb. 17, 2025

Language: Английский

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Reconfigurable MEMS‐based Perfect Meta‐absorber with Ultrahigh‐Q and Angle‐dependent Characteristics for Sensing Applications

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: March 26, 2025

Abstract We present two designs of perfect meta‐absorbers (PMAs) utilizing metallic plasmonic grating, and they have resonances with ultranarrow bandwidth in the order nanometers great surface electric field enhancement through coupling resonance plasmon polaritons (SPPs) grating waves. Notably, grating‐coupled demonstrates pronounced incident angle dependence ambient refractive index sensitiveness. Meanwhile, its dependencies are almost linearly controlled. PMA metal‐metal (MMG) structure has period‐dependent angular sensitivity shows a 4.0039 µm/RIU that maximum figure merit (FOM) value is 2300 RIU −1 under normal light. The sensitivities 3.6514 4.3486 FOM values 2783 3941 for different oblique incidence 5°. Another design metal‐insulator‐metal (MIMG) both SPP localized (LSP) modes, it can achieve single‐frequency scanning spectral region from wavelengths 3 µm to 5 by changing or index. Finally, reconfigurable achieves active regulation irradiation simultaneously realize functions tuning, sensing so on.

Language: Английский

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MEMS electrothermal actuator with highly linear actuation and stable characteristics

Materials Chemistry and Physics, Journal Year: 2025, Volume and Issue: unknown, P. 130967 - 130967

Published: April 1, 2025

Language: Английский

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MEMS-based meta-emitter with actively tunable radiation power characteristic

Discover Nano, Journal Year: 2024, Volume and Issue: 19(1)

Published: Aug. 24, 2024

We propose a meta-emitter based on micro-electro-mechanical system (MEMS) technology. The main structure of the unit cell is composed four symmetrically split crosses Au and SiO2 bilayer cantilevers. By changing size cantilevers, this MEMS-based can realize tunable perfect absorption, absorption spectrum within longwave infrared (LWIR) wavelength from 8.90 to 11.90 µm. When surface temperature rises, electrothermal actuation mechanism performed through different thermal expansion coefficient (TEC) Therefore, cantilevers will be bent downward bending height decreases linearly. In such case, peak value radiation power tuned 9.52 µm 10.48 when increased 293 1290 K. This proposed an excellent LWIR light source has potential application prospects in gas sensing, spectroscopy analysis, medical care so on.

Language: Английский

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Actively tunable H-shaped metamaterial absorber with perfect triple-absorption resonance

Alexandria Engineering Journal, Journal Year: 2024, Volume and Issue: 115, P. 169 - 176

Published: Dec. 17, 2024

Language: Английский

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Design and analysis of micro-electrostatic actuator with trapezoidal-shaped comb fingers and folded beams

Results in Engineering, Journal Year: 2024, Volume and Issue: unknown, P. 103807 - 103807

Published: Dec. 1, 2024

Language: Английский

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