Fan Qingbin, Liu Mingze, Zhang Cheng, Zhu Wenqi, Wang Yilin, Lin Peicheng, Yan Feng, Chen Lu, Lezec Henri J, Lu Yanqing, Agrawal Amit, Xu Ting
National Laboratory of Solid-State Microstructures and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.
Phys Rev Lett. 2020 Dec 31;125(26):267402. doi: 10.1103/PhysRevLett.125.267402.
Exquisite polarization control using optical metasurfaces has attracted considerable attention thanks to their ability to manipulate multichannel independent wavefronts with subwavelength resolution. Here we present a new class of metasurface polarization optics, which enables imposition of two arbitrary and independent amplitude profiles on any pair of orthogonal states of polarization. The implementation method involves a polarization-dependent interference mechanism achieved by constructing a metasurface composed of an array of nanoscale birefringent waveplates. Based on this principle, we experimentally demonstrate chiral grayscale metasurface and chiral shadow rendering of structured light. These results illustrate a general approach interlinking amplitude profiles and orthogonal states of polarization and expands the scope of metasurface polarization shaping optics.
利用光学超表面实现的精确偏振控制因其能够以亚波长分辨率操纵多通道独立波前而备受关注。在此，我们展示了一类新型的超表面偏振光学器件，它能够在任意一对正交偏振态上施加两个任意且独立的振幅分布。该实现方法涉及一种依赖偏振的干涉机制，通过构建由纳米级双折射波片阵列组成的超表面来实现。基于这一原理，我们通过实验证明了手性灰度超表面以及结构化光的手性阴影渲染。这些结果阐明了一种将振幅分布与正交偏振态相联系的通用方法，并扩展了超表面偏振整形光学的范围。
