TY - JOUR
T1 - Pseudospin-Polarized Topological Line Defects in Dielectric Photonic Crystals
AU - Chen, Menglin L.N.
AU - Jiang, Li Jun
AU - Lan, Zhihao
AU - Sha, Wei E.I.
N1 - Funding Information:
Manuscript received March 20, 2019; revised July 10, 2019; accepted August 5, 2019. Date of publication August 19, 2019; date of current version January 3, 2020. This work was supported in part by the Research Grants Council of Hong Kong under Grant GRF 17209918, in part by the AOARD under Grant FA2386-17-1-0010, in part by the NSFC under Grant 61271158, in part by the HKU Seed Fund under Grant 201711159228, and in part by the Thousand Talents Program for Distinguished Young Scholars of China. (Corresponding authors: Li Jun Jiang; Wei E. I. Sha.) M. L. N. Chen and L. J. Jiang are with the Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong (e-mail: [email protected]; [email protected]).
Funding Information:
This work was supported in part by the Research Grants Council of Hong Kong under Grant GRF 17209918, in part by the AOARD under Grant FA2386-17-1-0010, in part by the NSFC under Grant 61271158, in part by the HKU Seed Fund under Grant 201711159228, and in part by the Thousand Talents Program for Distinguished Young Scholars of China.
Publisher Copyright:
© 2019 IEEE.
PY - 2020/1
Y1 - 2020/1
N2 - 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.
AB - 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.
KW - Edge states
KW - finite-difference (FD) supercell approach
KW - photonic crystals (PCs)
KW - topological line defect
UR - http://www.scopus.com/inward/record.url?scp=85077956768&partnerID=8YFLogxK
U2 - 10.1109/TAP.2019.2934816
DO - 10.1109/TAP.2019.2934816
M3 - Journal article
AN - SCOPUS:85077956768
SN - 0018-926X
VL - 68
SP - 609
EP - 613
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 1
M1 - 8805239
ER -