WANG Dan; LI Jiusheng; XIONG Rihui

doi:10.7498/aps.74.20241762

Abstract

In this paper, we propose a vanadium dioxide and germanium telluride composite metasurface. The conductivity of vanadium dioxide and germanium telluride is varied by changing the temperature, which enables the switching of functions such as ultra-broadband absorption, reflective-type polarization, and transmissive-type polarization. When vanadium dioxide is metallic and germanium telluride is crystalline, the terahertz wave is incident along the –z direction, and the metasurface can be used as a broadband absorber, with an absorption rate greater than 90% in a frequency range of 7.96–17.76 THz, and the absorption bandwidth reaches 9.8 THz, with a relative bandwidth of 76.2%. In addition, the designed metasurface absorber is polarization-insensitive and exhibits good absorption performance at large incidence angles. Terahertz waves are incident along the +z direction, and this metasurface can be used as a reflective polarization converter with a polarization conversion ratio greater than 0.9 for x– and y–polarized waves in the frequency band from 2.04 to 4.44 THz. The effects of incidence angle and structural parameters on polarization conversion performance are also investigated. When vanadium dioxide is in the dielectric state and germanium telluride is in the amorphous state, the metasurface can be used as a transmissive polarization converter, with a polarization conversion rate of greater than 0.9 in a frequency band of 0.65–5.07 THz. And the high polarization conversion performance can be maintained in a wide range of incidence angles. Finally, the physical mechanism of polarization conversion is analyzed using surface currents. The results show that the metasurface structure has bi-directional, switchable and multi-functional characteristics for terahertz wave manipulation, and has broad application prospects in terahertz wave sensing, imaging and communication.

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Corresponding author: LI Jiusheng, lijsh2008@126.com

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 62271460, 62435017) and the Natural Science Foundation of Zhejiang Province, China (Grant No. LZ24F050005).

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Cited By

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文献	可调材料	功能	性能	带宽
[18]	Graphene	宽带吸收和极化转换	1.74—3.52 THz: A≥90% 1.54—2.55 THz: PCR^r≥90%	吸收1.78 THz 反射极化转换1.01 THz
[19]	VO₂和Si	宽带吸收和极化转换	0.68—1.60 THz: A≥90% 0.82—1.60 THz: PCR^r≥90%	吸收0.92 THz 反射极化转换0.78 THz
[20]	VO₂	宽带吸收和极化转换	3.33—5.62 THz: A≥90% 2.54—4.55 THz: PCR^r≥90%	吸收2.29 THz 反射极化转换2.01 THz
[10]	VO₂	宽带吸收和极化转换	1.49—3.58 THz: A≥90% 1.1—3.2 THz: PCR^r≥90%	吸收2.09 THz 反射极化转换2.1 THz
本文	VO₂和GeTe	宽带吸收和极化转换	7.96—17.76 THz: A≥90% 2.04—4.44 THz: PCR^r≥90% 0.65—5.07 THz: PCR^t≥90%	吸收9.8 THz 反射极化转换2.4 THz 透射极化转换4.42 THz

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Vol. 74, Issue 13 - 2025-07-05

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