文献类型：期刊文献

英文题名：Emergent topological interfacial states in 3D photonic crystals via half-period structural shifts

作者：Xu, Mengyao[1];He, Qinghua[1];Wang, Wenhui[1];Liu, Feng[2,3]

机构：[1]Ningbo Univ, Sch Phys Sci & Technol, Ningbo, Peoples R China;[2]Eastern Inst Technol, Ningbo, Peoples R China;[3]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China

年份：2025

卷号：33

期号：10

起止页码：22019

外文期刊名：OPTICS EXPRESS

收录：SCI-EXPANDED(收录号：WOS:001502308400005)、、EI(收录号：20252118463607)、Scopus(收录号：2-s2.0-105005485242)、WOS

基金：National Natural Science Foundation of China (12074205) .

语种：英文

外文关键词：Photonic band gap - Topology

外文摘要：While higher-order two-dimensional (2D) topological photonic crystals have been extensively explored, 3D analogues remain scarce despite their potential for richer topological phenomena and applications in robust 3D photonic networks. In this work, we propose a strategy to engineer 3D topological photonic crystals by constructing interfaces between inversion-symmetric lattices and their half-lattice-shifted counterparts-a 3D generalization of the topological interfaces in the Su-Schrieffer-Heeger model. By designing a hexagonal lattice photonic crystal with tunable band gaps, we demonstrate that either the original or half-period-shifted configurations exhibit a non-trivial Zak phase of pi along all three primitive lattice directions. Numerical simulations reveal the emergence of surface states at planar interfaces, hinge states at 1D corners, and also 0D corner states, indicative of higher-order topology. This work not only advances the designs of 3D topological photonic crystals but also opens avenues for applications in fault-tolerant photonic circuits and multidimensional light trapping.