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Abstract

Terahertz metasurface functional devices as an effective method to control terahertz waves have attracted extensive attention from researchers. In order to enhance the functionality and flexibility of the metasurface and adapt to diverse application scenarios and demands, a beam-steering controllable reflective metasurface is designed by combining the Pancharatnam-Berry phase principle and the phase change material vanadium dioxide in this work. The metasurface unit consists of five layers, they being the top layer that is a metal patterned layer, the third layer that is made of vanadium dioxide and located between the dielectric layers with different thickness, the dielectric layer that is made of polytetrafluoroethylene (PTFE), and the bottom layer that serves as a metal reflective layer. The metasurface units are rotated based on the Pancharatnam-Berry phase principle to obtain four metasurface units with fixed phase differences in between, after which the metasurface units are arranged in two dimensions based on the generalized Snell reflection law to obtain the desired phase-gradient deflected reflection beam. The insulating state-metallic state transition of the vanadium dioxide layer on the metasurface can change the phase gradient of the preset metasurface, thereby realizing the on/off function of deflection. The simulation results show that when the vanadium dioxide is in the insulating state, the phase gradient of the designed metasurface appears, and the metasurface can deflect the vertically incident circularly polarized wave with specific angle anomalies in a operating band of 1.1–2.0 THz; when the vanadium dioxide is in the metallic state, for the same operating band of the same metasurface, the phase gradient of the metasurface disappears, and the metasurface mirror reflects the vertically incident circularly polarized waves, thereby realizing the function switching. This design provides new possibilities for modulating the terahertz reflected beam, which will have potential applications in terahertz wireless communication and radar systems.

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Corresponding author:Ge Hong-Yi,gehongyi2004@163.com

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 62271191, 61975053), the Natural Science Foundation of Henan Province, China (Grant No. 222300420040), the Innovative Funds Plan of Henan University of Technology (Grant No. 2021ZKCJ04), the Key Science and Technology Program of Henan Province, China (Grant Nos. 222102110246, 222103810072), and the Program for Science & Technology Innovation Talents in Universities of Henan Province, China (Grant Nos. 23HASTIT024, 22HASTIT017).

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DownLoad: Full-Size Img PowerPoint

Parameter	D	R₁	R₂	L₁	L₂	K₁	K₂	T₁	T₂	T₃	H₁	H₂
Value/μm	110	10	19	60	51	8	8	0.2	0.3	0.2	3	26

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α	45°	0°	135°	90°
俯视图
2-bit	00	01	10	11

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Vol. 73, Issue 22 - 2024-11-20

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