Jie Kaiqian, Huang Hui, Qin Shuai, Guo Jianping, Liu Hongzhan, Meng Hongyun, Wang Faqiang, Yang Xiangbo, Wei Zhongchao
Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China.
Nanomaterials (Basel). 2022 Apr 6;12(7):1228. doi: 10.3390/nano12071228.
A depolarizer, a kind of optical element that converts polarized light to unpolarized light, has been found massive applications in classical optics. However, depolarizers based on metasurface which can be applied in integrated optics have rarely been proposed. In this paper, an electronically controlled metasurface depolarizer is demonstrated based on the time-domain integral average method and nano-material barium titanate. It obtains emergent light with a degree of polarization reduced to 2.5% when hit by linearly polarized light at 633 nm, and has a transmission efficiency greater than 72%. This depolarizing metasurface can be designed on-demand, immunizing the degree of the emergent light from its size, and has the simple electronic control with high-speed response.
退偏器是一种将偏振光转换为非偏振光的光学元件，在经典光学中已有大量应用。然而，基于超表面且可应用于集成光学的退偏器却鲜有报道。本文基于时域积分平均法和纳米材料钛酸钡，展示了一种电控超表面退偏器。当受到波长为633nm的线偏振光照射时，该退偏器出射光的偏振度降低至2.5%，且传输效率大于72%。这种退偏超表面可按需设计，出射光的偏振度不受其尺寸影响，并且具有简单的电子控制和高速响应特性。
