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摘要

基于Pancharatnam-Berry相位原理和相变材料VO ₂的复合相位调控机制, 设计了一种波束转向可控的反射型超表面. 基于Pancharatnam-Berry相位原理对超表面单元顶层结构进行旋转编码, 获得所需的相位梯度, 而超表面VO ₂层绝缘态-金属态的转换, 可使预设超表面的相位梯度改变, 进而改变反射波束的转向. 仿真测试结果表明: 当VO ₂处于绝缘态时, 在1.1—2.0 THz工作频段内, 超表面可使垂直入射的圆极化波以特定的角度出射, 其反射效率大于80%; 当VO ₂处于金属态时, 对于同一超表面的相同工作频段, 超表面将入射的太赫兹波镜面反射, 反射效率接近100%. 这一设计对未来太赫兹反射波束调控领域具有潜在的应用价值.

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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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通信作者:葛宏义,gehongyi2004@163.com

基金项目:国家自然科学基金(批准号: 62271191, 61975053)、河南省自然科学基金(批准号: 222300420040)、河南工业大学创新基金(批准号: 2021ZKCJ04)、河南省重点科技计划(批准号: 222102110246, 222103810072)和河南省高校科技创新人才支持计划(批准号: 23HASTIT024, 22HASTIT017)资助的课题.

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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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施引文献

下载: 全尺寸图片幻灯片

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

下载: 导出CSV

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

下载: 导出CSV

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