Pseudospin-Polarized Topological Line Defects in Dielectric Photonic Crystals

被引：71

作者：

Chen, Menglin L. N. ^{[1
]}

Jiang, Li Jun ^{[1
]}

Lan, Zhihao ^{[2
]}

Sha, Wei E. I. ^{[2
,3
]}

机构：

[1] Univ Hong Kong, Dept Elect & Elect Engn, Hong Kong, Peoples R China

[2] UCL, Dept Elect & Elect Engn, London WC1E 6BT, England

[3] Zhejiang Univ, Coll Informat Sci & Elect Engn, Key Lab Micronano Elect Devices & Smart Syst Zhej, Hangzhou 310027, Peoples R China

来源：

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 2020年 / 68卷 / 01期

关键词：

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

D O I：

10.1109/TAP.2019.2934816

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页码：609 / 613

页数：5

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