MEMS reconfigurable terahertz meta-absorber with polarization-dependent and sensing characteristics

Results in Physics, Journal Year: 2024, Volume and Issue: 63, P. 107861 - 107861

Published: July 3, 2024

This study presents and demonstrates a design of micro-electro-mechanical system (MEMS) reconfigurable terahertz (THz) metamaterial absorber (TMA) that shows tunable free spectra range with maximum value as 166 GHz in transverse magnetic mode switchable resonance from 1.24 THz to 1.53 THz. The unit structure TMA consists two movable rectangular resonators aside an x-shaped resonator at the center comprising c-shaped connected upside down. material configuration is typical metal–insulator-metal sandwich configuration. That bottom Au layer preventing penetration wave, dielectric SiO2 accommodate absorb incident patterned array select resonant frequency. electromagnetic response could be flexibly modulated when reconfigured by changing gaps between based on MEMS platform. Meanwhile, owing asymmetry structure, tuned single-, dual-, triple- quad-resonances varying polarization state incidence. Furthermore, sensitivity explored demonstrated remarkable linearity under variation surrounding environment refractive index 1.0 2.0. feasibility validated experimental absorption are well meet simulation results. above results indicate proposed possesses great potential applications multiple switches, highly efficient environmental sensors.

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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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 Visible Metasurface for Color Sensor Application

Materials Today Communications, Journal Year: 2025, Volume and Issue: unknown, P. 111685 - 111685

Published: Jan. 1, 2025

Language: Английский

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Photonic-spin-controlled second-order nonlinear frequency conversion on permittivity-asymmetry lithium niobite dimer metasurfaces governed by chiral quasibound states in the continuum

Physical review. B./Physical review. B, Journal Year: 2025, Volume and Issue: 111(7)

Published: Feb. 3, 2025

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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Multifunctional bio-enzyme sensor empowered by bound states in the continuum via a Si-VO₂ metasurface

Physica Scripta, Journal Year: 2025, Volume and Issue: 100(4), P. 045504 - 045504

Published: Feb. 21, 2025

Abstract Bound states in the continuum (BIC) present a novel avenue for advancing high-quality factor metasurfaces, promising high-performance lasers, sensors, and nonlinear optical devices at nanoscale. Currently, sensors designed based on BIC have achieved good sensing performance. However, functionality of current metasurface is relatively singular, rendering them less chance complex scenarios. Specifically, taking bio-enzyme sensor as an example, since different bio-enzymes optimal reaction temperatures, it mostly inescapable to design multiple detection. In this paper, we developed multifunctional that can adapt temperatures bio-enzymes, meeting requirements The proposed consists two elliptical cylinders, which excite high-Q quasi-BIC resonance by changing their rotation angles. By introducing VO 2 film, external ambient temperature effectively manipulate transmission modulation depth quasi-BIC. Simulation results show maximum relative reach 296%. When combined with serves refractive index sensitivity high 370 nm RIU −1 30 °C 80 °C. Our work provides insights highly integrated tunable future.

Language: Английский

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High-Q Resonance Engineering in Momentum Space for Highly Coherent and Rainbow-Free Thermal Emission

Nano Letters, Journal Year: 2025, Volume and Issue: 25(9), P. 3613 - 3619

Published: Feb. 21, 2025

Thermal emission from blackbody is typically incoherent and broadband. Achieving highly coherent thermal source while eliminating the rainbow effect has been remaining a challenging task. In our study, we utilize isolated nature of bound states in continuum (BICs) at Γ point to achieve with high temporal spatial coherence. Under framework coupled mode theory (TCMT), can significantly reduce Q-factors modes outside by employing far-field coupling different polarization channels within momentum space, thereby suppressing effect. Our design, experimentally validated through ternary grating structures, demonstrates centered 6.5 μm 23 nm bandwidth, confined 2° angular range. This advancement holds significant implications for miniaturization integration radiation devices, potential applications infrared imaging, sensing, energy harvesting.

Language: Английский

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A Circumvolution Phase of Metasurface Based on Rotational Circular Ring Configuration

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 26, 2025

Abstract In this study, a phase of metasurface is proposed based on rotational ring configuration, whose tuning principle associated with its conversion between spin angular and orbital momentum. The focusing vortex beams could be obtained steerable focal plane. spin‐selection mechanisms shifting process depend the corresponding momentums. To promote practical application, relationships mechanical performance, i.e., limited circumvolution angle optical properties including range length momentum are analyzed discussed, indicating that demand implementation would lower by increasing converted sparse aperture then demonstrated as an effective solution to implement involved high This work will pave way for designing tunable facilitating their applications in areas manipulation vortex‐based communication.

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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