Yu Ping, Li Jianxiong, Liu Na
Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany.
2nd Physics Institute, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
Nano Lett. 2021 Aug 11;21(15):6690-6695. doi: 10.1021/acs.nanolett.1c02318. Epub 2021 Jul 21.
Dynamic control over the polarization of light is highly desirable in many optical applications, including optical communications, laser science, three-dimensional displays, among others. Conventional methods for polarization control are often based on bulky optical elements. To achieve highly integrated optical devices, metasurfaces, which have been intensively studied in recent years, hold great promises to replace conventional optical elements for a variety of optical functions. In this work, we demonstrate electrically tunable optical metasurfaces for dynamic polarization conversion at visible frequencies. By exploring both the geometric and propagation phase tuning capabilities, rapid and reversible polarization rotation up to 90° is achieved for linearly polarized light. The dynamic functionality is imparted by liquid crystals, which serve as a thin surrounding medium with electrically tunable refractive indices for the metasurface antennas. Furthermore, we expand our concept to demonstrate electrically tunable metasurfaces for dynamic holography and holographic information generation with independently controlled multiple pixels.
在许多光学应用中，包括光通信、激光科学、三维显示等，对光的偏振进行动态控制是非常必要的。传统的偏振控制方法通常基于笨重的光学元件。为了实现高度集成的光学器件，近年来得到深入研究的超表面有望替代传统光学元件来实现多种光学功能。在这项工作中，我们展示了用于可见频率动态偏振转换的电可调谐光学超表面。通过探索几何相位和传播相位调谐能力，对于线偏振光实现了高达90°的快速且可逆的偏振旋转。这种动态功能由液晶赋予，液晶作为一种薄的周围介质，其折射率对于超表面天线是电可调的。此外，我们扩展了我们的概念，展示了用于动态全息术和具有独立控制的多个像素的全息信息生成的电可调谐超表面。
