Lv Haoran, Mou Zhen, Zhou Changda, Wang Shuyun, He Xiaobo, Han Zhanghua, Teng Shuyun
Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250014, People's Republic of China.
Nanotechnology. 2021 May 10;32(31). doi: 10.1088/1361-6528/abf96a.
A circular polarizer is proposed based on a single layered metasurface. This metasurface circular polarizer is composed of L-shaped nanoholes etched on the silver film. The L-shaped nanoholes are rotational symmetric, and the special symmetric structure determines the polarization selection transmission of the metasurface. The theoretical analysis elaborates the design process of the metasurface circular polarizer. The proposed metasurface circular polarizers have good polarization selective transmittance, and more interestingly, they take on the opposite circular dichroism at different wavebands. The numerical simulations and experiment measurement confirm the circular dichroism of the proposed circular polarizers. The compact design, ultrathin thickness and available performance can expand the applications of the metasurface circular polarizers in the integrated optics.
提出了一种基于单层超表面的圆偏振器。这种超表面圆偏振器由蚀刻在银膜上的L形纳米孔组成。L形纳米孔具有旋转对称性，这种特殊的对称结构决定了超表面的偏振选择透射特性。理论分析阐述了超表面圆偏振器的设计过程。所提出的超表面圆偏振器具有良好的偏振选择透过率，更有趣的是，它们在不同波段呈现相反的圆二色性。数值模拟和实验测量证实了所提出圆偏振器的圆二色性。其紧凑的设计、超薄的厚度和良好的性能可拓展超表面圆偏振器在集成光学中的应用。
