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Local orbital-angular-momentum dependent surface states with topological protection

Chen, MLN; Jun Jiang, L; Lan, Z; Sha, WEI; (2020) Local orbital-angular-momentum dependent surface states with topological protection. Optics Express , 28 (10) pp. 14428-14435. 10.1364/OE.387993. Green open access

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Abstract

Chiral surface states along the zigzag edge of a valley photonic crystal in the honeycomb lattice are demonstrated. By decomposing the local fields into orbital angular momentum (OAM) modes, we find that the chiral surface states present OAM-dependent unidirectional propagation characteristics. Particularly, the propagation directivities of the surface states are quantified by the local OAM decomposition and are found to depend on the chiralities of both the source and surface states. These findings allow for the engineering control of the unidirectional propagation of electromagnetic energy without requiring an ancillary cladding layer. Furthermore, we examine the propagation of the chiral surface states against sharp bends. It turns out that although only certain states successfully pass through the bend, the unidirectional propagation is well maintained due to the topology of the structure.

Type: Article
Title: Local orbital-angular-momentum dependent surface states with topological protection
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OE.387993
Publisher version: https://doi.org/10.1364/OE.387993
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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/10117598
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