Tunable reflective liquid crystal terahertz waveplates
Tunable reflective liquid crystal terahertz waveplates
复制标题
可调谐反射液晶太赫兹波片
DOI：
10.1364/ome.7.002023
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发表时间：
2017-06-01
影响因子：
2.8
通讯作者：
Lu, Yanqing
中科院分区：
文献类型：
--
作者：
Wang, Lei;Ge, Shijun;Lu, Yanqing
可连续改变太赫兹波偏振态的可调谐液晶器件在太赫兹光学系统中有许多潜在的应用[1]。我们提出了一种具有亚波长金属光栅和金属接地平面电极的反射式液晶太赫兹波片[2]。液晶层的厚度可以减小到透射波片中在给定频率下相同相移所需厚度的约10%。我们通过实验证明了与透射型相同的可调谐性，只需使用一半的厚度[3]。我们讨论了相移可调谐性对入射角的依赖关系，相移可调谐性可以同时实现光束转向和偏振转换。
Tunable liquid crystal devices that can change terahertz (THz) wave polarization continuously have many potential applications in THz optical systems [1]. We present a reflective liquid crystal THz waveplate with sub-wavelength metal grating and metal ground plane electrodes [2]. The thickness of the liquid crystal layer can be reduced to ~10% of that needed for the same phase shift at a given frequency in a transmissive waveplate. We experimentally demonstrate the same tunability as in the transmissive type just using half the thickness [3]. We discuss the dependence on the angle of incidence for phase shift tunability, which can achieve beam steering and polarization conversion at the same time.