摘要
设计出基于几何相位的介质超表面实现线偏振光聚焦功能。该设计打破了传统设计中几何相位(Pancharatnam-Berry phase)的手性限制,不再是局限于左旋圆偏振光(LCP)和右旋圆偏振光(RCP)入射。通过有限时域差分仿真来证明这种线偏振聚焦相位调控的特性。该类功能器件可能用于设计新颖的THz元器件、高分辨成像、功能探测等方面。
We proposed a dielectric metasurface that can focus linearly polarized lights based on geometric phase.The proposed approach is insensitive to both LCP and RCP incident beams,that is,breaking the traditional helicity-dependent geometric metasurface.The corresponding characteristics are demonstrated based on the finite-difference time-domain calculation.Such a device may have potential applications in high-resolution imaging,novel terahertz devices,functional detection and so on.
作者
丁洪贞
臧小飞
DING Hongzhen;ZANG Xiaofei(Shanghai Key Laboratory of Modem Optical Systems,University of Shanghai for Science and Technology,Shanghai 200093,China;School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《光学仪器》
2020年第1期14-19,31,共7页
Optical Instruments
基金
国家自然科学基金(61871268)
国家重点研发计划(2017YFA0701005)。
关键词
太赫兹波
超表面
几何相位
线偏振光聚焦
terahertz
metasurface
geometric phase
the focusing of the metasurface illuminated by linearly polarized light
