Nodal degeneracy of guided modes in uniaxial crystal slabs

Autor: Xinyang Pan, Haitao Li, Weijie Dong, Xiaoxi Zhou, Ke-Ao Xing, Chuandeng Hu, Gang Wang, Bo Hou
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Frontiers in Physics, Vol 10 (2023)
Druh dokumentu: article
ISSN: 2296-424X
DOI: 10.3389/fphy.2022.1095669
Popis: We study the dispersions of the guided modes in the continuous uniaxial crystal slab waveguide and engineer their degeneracies through dielectric anisotropy. By switching the uniaxial positivity and negativity, we can obtain distinctive nodal types, point and line, for the lowest degeneracy in frequency. The mirror symmetry protections, Mx and My, are pointed out, and the degeneracy properties are intuitively analyzed through comparing the approximate slopes of the guided modes. Our results reveal a link between the lowest nodal types and the positivity/negativity of the uniaxial crystal, and provide a new approach to regulate the topology of degeneracy in two-dimensional photonic bands.
Databáze: Directory of Open Access Journals