Multifunctional metamaterial device based on VO<sub>2</sub> and the equivalent diode

Zelong Wang; Xin Wang; Junlin Wang; Shengjie Sun; Huizhong Pang; Kaixuan Shi; Xingyu Pei

doi:10.1364/AO.506094

Applied Optics
Vol. 63,
Issue 8,
pp. 2109-2120
(2024)
•https://doi.org/10.1364/AO.506094

Multifunctional metamaterial device based on VO₂ and the equivalent diode

Zelong Wang, Xin Wang, Junlin Wang, Shengjie Sun, Huizhong Pang, Kaixuan Shi, and Xingyu Pei

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Zelong Wang, Xin Wang, Junlin Wang, Shengjie Sun, Huizhong Pang, Kaixuan Shi, and Xingyu Pei, "Multifunctional metamaterial device based on VO₂ and the equivalent diode," Appl. Opt. 63, 2109-2120 (2024)

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Table of Contents Category
- Optical Devices, Sensors, and Detectors
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About this Article
History
- Original Manuscript: September 19, 2023
- Revised Manuscript: December 23, 2023
- Manuscript Accepted: February 19, 2024
- Published: March 7, 2024

Abstract

This paper proposes a switchable multifunctional metamaterial device operating in the terahertz (THz) band. The device is loaded with an equivalent diode and utilizes vanadium dioxide (${{\rm VO}_2}$). The middle layer of the whole device, a metal layer, divides the device into the I side and the II side. When the diode is ON, the I side can achieve dual-band absorption at 1.975 and 4.345 THz. When the diode is OFF, the I side can achieve single-band absorption at 4.28 THz. In the case of ${{\rm VO}_2}$ being insulating, the II side can achieve linear-to-linear (LTL) polarization conversion at 2.342–4.18 THz. In the case of ${{\rm VO}_2}$ being conductive, the II side can realize linear-to-circular (LTC) polarization conversion at 2.105–3.283 THz. The device provides a new strategy for the subsequent combination of multiple functions. The device can be used in electromagnetic stealth, intelligent applications, radiometers, and sensors and has relatively large application potential in miniaturized multifunctional metamaterials and THz band research.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Reference	Functions	Tunable Materials	Performance and Results
[32]	Beam splitting and focusing; Absorber	${V O}_{2}$	Absorptivity $> 99.5 %$ at 1.69 THz
[33]	Dual-band absorption and multi-frequency transmission	${V O}_{2}$ and graphene	Transition $< 0.49 %$ at 1.992 THz and 2.276 THz; Absorptivity $> 90 %$ at 0.684–0.924 THz, 2.86–3.04 THz, and 3.28–3.372 THz
[34]	Broadband absorption and multiband absorption	${V O}_{2}$ and graphene	Broadband absorptivity $> 90 %$ at 2.6–7.5 THz; Tunable nineband absorption at 0–10 THz
[35]	LTC and LTL	${V O}_{2}$	$P C R > 90 %$ at 0.912–2.146 THz; Ellipticity is close to $- 1$ at 1.07–1.67 THz
[36]	LTC, LTL, and EIT-like	${V O}_{2}$	Ellipticity is close to $- 1$ at 0.444–0.751 THz; $P C R > 94 %$ at 0.668–0.942 THz; EIT-like transmission window at 0.796–0.939 THz
[37]	Circular polarization conversion and AT effect	${V O}_{2}$	Circular polarization conversion at 1.52–2.50 THz and 2.93 THz; Asymmetric transmission effect at 2.43 and 3.19 THz
This work	Dual-band and single-band absorption; LTL and LTC	${V O}_{2}$	Dual-band absorptivity $> 99.39 %$ and 99.63% at 1.975 THz and 4.345 THz, respectively; Single-band absorptivity $> 99.99 %$ at 4.28 THz; $P C R > 90 %$ at 2.342–4.18 THz; Ellipticity is close to 1 at 2.105–3.283 THz

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