Pseudospin-Polarized Topological Line Defects in Dielectric Photonic Crystals

Menglin L.N. Chen, Li Jun Jiang, Zhihao Lan, Wei E.I. Sha

Research output: Journal article publicationJournal articleAcademic researchpeer-review

31 Citations (Scopus)

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.

Original languageEnglish
Article number8805239
Pages (from-to)609-613
Number of pages5
JournalIEEE Transactions on Antennas and Propagation
Volume68
Issue number1
DOIs
Publication statusPublished - Jan 2020
Externally publishedYes

Keywords

  • Edge states
  • finite-difference (FD) supercell approach
  • photonic crystals (PCs)
  • topological line defect

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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