Open AccessPolarization-resolved edge states in terahertz topological photonic crystal
Author(s) -
Hao Xiong,
Qiang Wu,
Yao Lu,
Ride Wang,
Qi Zhang,
Jiwei Qi,
Jianghong Yao,
Jingjun Xu
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.022819
Subject(s) - terahertz radiation , photonic crystal , polarization (electrochemistry) , photonics , topology (electrical circuits) , optics , physics , dielectric , optoelectronics , materials science , chemistry , mathematics , combinatorics
The discovery of topological photonic states has revolutionized our understanding of electromagnetic propagation and scattering. With the introduction of topology, some attractive properties such as unidirectional propagation and robustness against defects and impurities will be endowed to photonic edge modes. In this study, two-dimensionally confined topological edge states were achieved at terahertz (THz) frequency based on an all-dielectric photonic crystal structure. Trivial and nontrivial bandgaps of two deforming honeycomb lattices as well as unidirectional topological edge states were observed. Because the topological edge states with opposite helicity propagated in opposite directions at the interface, a polarization-resolved characteristic was demonstrated here, and thus a continuously tunable power splitter was achieved. This study provides some insights for further THz topological studies and possibilities for THz integrated platforms.