Chen, MLN;
Jiang, LJ;
Lan, Z;
Sha, WEI;
(2019)
Pseudospin-Polarized Topological Line Defects in Dielectric Photonic Crystals.
IEEE Transactions on Antennas and Propagation
, 68
(1)
pp. 609-613.
10.1109/TAP.2019.2934816.
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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.
| Type: | Article |
|---|---|
| Title: | Pseudospin-Polarized Topological Line Defects in Dielectric Photonic Crystals |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/TAP.2019.2934816 |
| Publisher version: | https://doi.org/10.1109/TAP.2019.2934816 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10113247 |
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