中国激光, 2020, 47 (3): 0301007, 网络出版: 2020-03-12
偏振特异的聚焦和波前保持的双模超表面 下载: 1161次
Dual-Mode Metasurface of Polarization-Specific Focusing and Keeping Wavefront
光学器件 双模超表面 偏振响应 几何相位 传输相位 optical devices dual-mode metasurface polarization response geometric phase propagation phase
摘要
设计出一种对左旋和右旋圆偏振光产生各向异性相位调制的双模超表面器件。该器件在改变硅纳米柱尺寸进而调控传输相位的同时,改变了其面内旋向获得附加的几何相位。由于两种相位的结合,入射到超表面器件的右旋圆偏振光实现了44.8%的聚焦效率,而对于入射左旋圆偏振光,则保持其平面波前透射。该超表面器件作为小型化偏振器件可应用于信息加密传输等领域。
Abstract
A dual-mode metasurface device is designed to achieve phase modulation with anisotropic response depending on the left and right-handed circularly polarized light. This device can control the sizes of the Si nanoblock in order to regulate the transmission phase, and require additional geometric phase by controlling its in-plane direction, simultaneously. By combining the two phases, the metasurface focuses the right-handed circularly polarized incident beam with an efficiency as high as 44.8%, while keeping the plane wavefront transmission of the left-handed circularly polarized incident beam. The designed metasurface could be used as a miniaturized polarizer in information encrypted transmission field.
罗宇, 王文涛, 赵鹏九, 刘首鹏, 刘智颖, 付跃刚, 陈晓虎. 偏振特异的聚焦和波前保持的双模超表面[J]. 中国激光, 2020, 47(3): 0301007. Luo Yu, Wang Wentao, Zhao Pengjiu, Liu Shoupeng, Liu Zhiying, Fu Yuegang, Chen Xiaohu. Dual-Mode Metasurface of Polarization-Specific Focusing and Keeping Wavefront[J]. Chinese Journal of Lasers, 2020, 47(3): 0301007.