Irrotational Nanobricks Based High-Efficiency Polarization-Independence Metasurfaces

IEEE Photonics Journal

Wei Wang¹  Chong Guo¹  Zehan Zhao¹  Jinghua Sun²  Zhongyi Guo²  Fei Shen² 

[1] Department of Mathematics and Physics, Shijiazhuang Tiedao University, Shijiazhuang, China;School of Electrical Engineering and Intelligentization, Dongguan University of Technology, Dongguan, China;

关键词: Metasurface;    spin;    phase modulation;    polarization-independence;   

DOI  :  10.1109/JPHOT.2020.3002692

来源: DOAJ

【 摘 要 】

The polarization-independence optical metasurface has attracted great interests due to breaking the polarization limitations. In general, polarization-independence characteristics of metasurface almost always originates from the polarization-independence characteristics of the used resonant antenna itself. In this paper, a novel approach is proposed to achieve polarization-independence metasurface based on the irrotational nanobricks. Firstly, the intrinsic characteristics of a half wave plate has been investigated, which can realize co-polarization transmission of X-linear-polarization (XLP) and Y-linear-polarization (YLP) lights, and cross-polarization transmission of circular polarization (CP) light, simultaneously. Eight high-efficiency silicon nanobricks with the phase shifts over 2π are designed as the basic unit cell, which have the same transmitted amplitude and phase for the CP and XLP light, and the phase difference for XLP and YLP light. We have also designed the beam deflector, metalens and vortex beam generator, which possess identical function for cross-polarized CP and co-polarized XLP and YLP light, respectively. These results can promote the deeper understanding of metasurface, and give a new method to design polarization-independent optical devices.

【 授权许可】

Unknown