Abstract
Electromagnetic (EM) topological insulators have been extensively explored due to the robust edge states they support. In this work, we propose a topological EM system based on a line defect in topologically nontrivial photonic crystals (PCs). With a finite-difference supercell approach, modal analysis of the PC structure is investigated in detail. The topological line-defect states are pseudospin polarized and their energy flow directions are determined by the corresponding pseudospin helicities. These states can be excited by using two spatially symmetric line-source arrays carrying orbital angular momenta. The feature of the unidirectional propagation is demonstrated, and it is stable when disorders are introduced to the PC structure.
Recommended Citation
M. L. Chen et al., "Pseudospin-Polarized Topological Line Defects In Dielectric Photonic Crystals," IEEE Transactions on Antennas and Propagation, vol. 68, no. 1, pp. 609 - 613, article no. 8805239, Institute of Electrical and Electronics Engineers, Jan 2020.
The definitive version is available at https://doi.org/10.1109/TAP.2019.2934816
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
Edge states; finite-difference (FD) supercell approach; photonic crystals (PCs); topological line defect
International Standard Serial Number (ISSN)
1558-2221; 0018-926X
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Institute of Electrical and Electronics Engineers, All rights reserved.
Publication Date
01 Jan 2020
Comments
Horizon 2020 Framework Programme, Grant FA2386-17-1-0010