Abstract
Edge states in topological photonic systems have the robust unidirectional propagation feature which originates from the topological nature of the bulk band dispersion. In this work, we propose a topological photonic crystal (PC) waveguide that is formed by introducing an air gap in an all-dielectric PC with C-{6v} symmetry. The dispersion of the line defect states is tunable by varying the width of the air gap. Based on their field distributions, the states can be classified into even- and odd-symmetric states. The even-symmetric states are found to be the nontrivial topological edge states and exhibit pseudospin-locking unidirectional propagation property. By introducing disorders to the waveguide, these states are proven to be robust with well suppressed backscattering.
Recommended Citation
M. L. Chen et al., "Tunable Topological Photonic Crystal Waveguides," 2021 International Applied Computational Electromagnetics Society Symposium, ACES-China 2021, Proceedings, Institute of Electrical and Electronics Engineers, Jul 2021.
The definitive version is available at https://doi.org/10.23919/ACES-China52398.2021.9581786
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
robust wave-guiding; topological photonics; tunable edge states
International Standard Book Number (ISBN)
978-173350961-9
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Institute of Electrical and Electronics Engineers, All rights reserved.
Publication Date
28 Jul 2021
Comments
National Natural Science Foundation of China, Grant FA2386-17-1-0010