用于光束偏转的具有可切换特性的宽带偏振转换元表面

IF 5.7 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yuhao Liang, Yuxin Liu, Weikai Huang and Yu-Sheng Lin
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引用次数: 0

摘要

我们介绍了一种与机电致动器 (EMA) 集成的动态可切换偏振转换元表面 (PCM),它能够在太赫兹 (THz) 光谱中切换圆偏振波反射波阵面的状态。所提出的 PCM 单元由双 L 形金结构组成,覆盖着悬浮在底部反射镜层上的介电层。该 PCM 显示出 0.74 太赫兹至 1.64 太赫兹的宽极化转换带,入射线极化(LP)和圆极化(CP)波的极化转换率为 90%。在这一宽带内,通过旋转 PCM 单元的取向角,可获得反射的正交 CP 波的完整 2π 相移,频率范围很广。通过模拟和讨论 PCM 的反常反射效应,验证了基于 Pancharatnam-Berry 相位理论和广义斯涅耳定律的可切换编码元表面的性能。特别是,反射效率可通过改变可移动配置进行动态调整。所提出的 PCM 在成像和通信系统中具有巨大的应用潜力,这为开发可调制太赫兹波面的多功能设备开辟了新途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Broadband polarization conversion metasurface for beam deflection with switchable characteristics

Broadband polarization conversion metasurface for beam deflection with switchable characteristics

Broadband polarization conversion metasurface for beam deflection with switchable characteristics

We present a dynamically switchable polarization conversion metasurface (PCM) integrated with an electromechanical actuator (EMA) that enabled the switching of states for the reflected wavefront of circularly polarized waves in the terahertz (THz) spectrum. The unit cell of the proposed PCM was composed of double L-shaped Au structures covering a dielectric layer suspended atop a bottom reflective mirror layer. The PCM showed a broad polarization conversion band ranging from 0.74 THz to 1.64 THz with a polarization conversion ratio >90% for incident linear polarized (LP) and circular polarized (CP) waves. Within this broadband, the full 2π phase shifts of the reflected orthogonal CP wave could be obtained by rotating the orientation angle of the PCM unit cell spanning a wide frequency range. The anomalous reflection effect of PCM was simulated and discussed to validate the performance of the proposed switchable coding metasurface based on Pancharatnam–Berry phase theory and the generalized Snell's law. In particular, the reflection efficiency could be tuned dynamically by transforming the movable configuration. The proposed PCM had significant potential for applications in imaging and communication systems, which opens new avenues for the development of multifunctional devices that can modulate THz wavefronts.

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来源期刊
Journal of Materials Chemistry C
Journal of Materials Chemistry C MATERIALS SCIENCE, MULTIDISCIPLINARY-PHYSICS, APPLIED
CiteScore
10.80
自引率
6.20%
发文量
1468
期刊介绍: The Journal of Materials Chemistry is divided into three distinct sections, A, B, and C, each catering to specific applications of the materials under study: Journal of Materials Chemistry A focuses primarily on materials intended for applications in energy and sustainability. Journal of Materials Chemistry B specializes in materials designed for applications in biology and medicine. Journal of Materials Chemistry C is dedicated to materials suitable for applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry C are listed below. This list is neither exhaustive nor exclusive. Bioelectronics Conductors Detectors Dielectrics Displays Ferroelectrics Lasers LEDs Lighting Liquid crystals Memory Metamaterials Multiferroics Photonics Photovoltaics Semiconductors Sensors Single molecule conductors Spintronics Superconductors Thermoelectrics Topological insulators Transistors
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