Electromechanically tunable metasurface transmission waveplate at terahertz frequencies
Electromechanically tunable metasurface transmission waveplate at terahertz frequencies
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DOI：
10.1364/optica.5.000303
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发表时间：
2018-03-20
期刊：
影响因子：
10.4
通讯作者：
Zhang, Xin
中科院分区：
文献类型：
--
作者：
Zhao, Xiaoguang;Schalch, Jacob;Zhang, Xin
光的动态偏振控制对于从增强成像到材料表征和识别的许多应用都是必不可少的。我们提出了一种可重构太赫兹超颖表面四分之一波片组成的机电驱动的微悬臂梁阵列。我们的各向异性超颖表面通过悬臂梁致动实现可调偏振转换。具体地，基于电压的致动提供了对谐振频率的模式选择性控制，使得能够实时调谐透射光的偏振状态。偏振可调超颖表面已制作使用表面微加工和太赫兹时域光谱的特点。我们观察到一个类似的230 GHz的悬臂梁致动的谐振模式的频率偏移，足以调制从纯圆偏振到线偏振的传输波。我们的CMOS兼容可调谐四分之一波片丰富了太赫兹光学元件库，从而促进了太赫兹技术的实际应用。(C)2018年美国光学学会根据OSA开放获取出版协议的条款
Dynamic polarization control of light is essential for numerous applications ranging from enhanced imaging to material characterization and identification. We present a reconfigurable terahertz metasurface quarter-wave plate consisting of electromechanically actuated microcantilever arrays. Our anisotropic metasurface enables tunable polarization conversion through cantilever actuation. Specifically, voltage-based actuation provides mode-selective control of the resonance frequency, enabling real-time tuning of the polarization state of the transmitted light. The polarization tunable metasurface has been fabricated using surface micromachining and characterized using terahertz time domain spectroscopy. We observe a similar to 230 GHz cantilever actuated frequency shift of the resonance mode, sufficient to modulate the transmitted wave from pure circular polarization to linear polarization. Our CMOS-compatible tunable quarter-wave plate enriches the library of terahertz optical components, thereby facilitating practical applications of terahertz technologies. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement