Evolution of polarization singularities accompanied by avoided crossing in plasmonic system
Yi-Xiao Peng(彭一啸)1, Qian-Ju Song(宋前举)2,†, Peng Hu(胡鹏)1, Da-Jian Cui(崔大健)3, Hong Xiang(向红)1,‡, and De-Zhuan Han(韩德专)1,§
1 Chongqing University, Chongqing 400044, China; 2 School of Science, Southwest University of Science and Technology, Mianyang 621010, China; 3 Chongqing Key Laboratory of Core Optoelectronic Devices for Quantum Communication, Chongqing Optoelectronics Research Institute, Chongqing 400060, China
Abstract The evolution of polarization singularities supported in a one-dimensional periodic plasmonic system is studied. The lateral inversion symmetry of the system, which breaks the in-plane inversion symmetry and up-down mirror symmetry simultaneously, yields abundant polarization states. A complete evolution process with geometry for the polarization states is traced. In the evolution, circularly polarized points (C points) can stem from 3 different processes. In addition to the previously reported processes occurring in an isolated band, a new type of C point appearing in two bands simultaneously due to the avoided band crossing, is observed. Unlike the dielectric system with a similar structure which only supports at- bound states in the continuum (BICs), accidental BICs off the point are realized in this plasmonic system. This work provides a new scheme of polarization manipulation for the plasmonic systems.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12074049 and 12047564), the Fundamental Research Funds for the Central Universities, China (Grant Nos. 2020CDJQY-Z006 and 2020CDJQYZ003), and the Research Foundation of SWUST (Grant No. 21zx7141).
Corresponding Authors:
Qian-Ju Song, Hong Xiang, De-Zhuan Han
E-mail: qjsong@cqu.edu.cn;xhong@cqu.edu.cn;dzhan@cqu.edu.cn
Cite this article:
Yi-Xiao Peng(彭一啸), Qian-Ju Song(宋前举), Peng Hu(胡鹏), Da-Jian Cui(崔大健), Hong Xiang(向红), and De-Zhuan Han(韩德专) Evolution of polarization singularities accompanied by avoided crossing in plasmonic system 2023 Chin. Phys. B 32 014201
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