时域有限差分法
自旋(空气动力学)
奇点
各向异性
光子学
物理
极化(电化学)
凝聚态物理
拓扑(电路)
光电子学
材料科学
光学
几何学
数学
化学
物理化学
组合数学
热力学
作者
Yufu Liu,Xianjun Wang,Xunya Jiang,Xingchao Qi,Zhen Lai,Xuezhi Wang,Yunlin Li,Xunya Jiang
标识
DOI:10.1002/lpor.202300740
摘要
Abstract Although the spin‐controlled vortex generation and photonic spin‐Hall effect of spin‐flipped abnormal mode have been widely studied recently, the traditional method based on the metasurface is difficult to fabricate, and the efficiency of the spin‐flipped abnormal mode is rather low due to process errors and intrinsic material loss. Here, a new method is proposed based on the insights into the topological singularity and special Bragger reflections resonant (BRR) mode of one‐dimensional (1D) finite photonic crystals (PhCs) with anisotropic material to realize nearly perfect (100%) spin‐conversion efficiency. For a finite 1D PhC with cell number N , there are 3 N complete spin‐conversion (CSC) and complete spin‐maintained (CSM) channels. Two mechanisms of these CSC and CSM channels are revealed. The working bandwidths and the angular ranges of these CSC and CSM are also studied. Based on these theoretical findings, multi‐angles and multi‐frequencies perfect spin‐conversion (‐maintained) devices can be designed. At last, these theoretical results are confirmed by the numerical experiments based on finite‐difference time‐domain (FDTD) methods. This work paves the way to exploring the topological properties and polarization control of PhCs made of anisotropic dielectrics and provides a prospective method for the design of multi‐channels spin optical devices.
科研通智能强力驱动
Strongly Powered by AbleSci AI