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Title: Topological slow light via coupling chiral edge modes with flat bands
Authors: Yu, Letian
Xue, Haoran
Zhang, Baile
Keywords: Science::Physics::Optics and light
Issue Date: 2021
Source: Yu, L., Xue, H. & Zhang, B. (2021). Topological slow light via coupling chiral edge modes with flat bands. Applied Physics Letters, 118(7), 071102-.
Project: MOE2016‐T3‐1‐006 
MOE2018‐T2‐1‐022 (S) 
RG174/16 (S) 
Journal: Applied Physics Letters 
Abstract: Chiral edge modes in photonic topological insulators host great potential to realize slow-light waveguides with topological protection. Increasing the winding of the chiral edge mode around the Brillouin zone can lead to broadband topological slow light with ultra-low group velocity. However, this effect usually requires careful modifications on a relatively large area around the lattice edge. Here we present a simple and general scheme to achieve broadband topological slow light through coupling the chiral edge modes with flat bands. In this approach, modifications inside the topological lattice are not required. Instead, only several additional resonators that support the flat bands need to be attached at the lattice edge. We demonstrate our idea numerically using a gyromagnetic photonic crystal, which is ready to be tested at microwave frequencies.
ISSN: 0003-6951
DOI: 10.1063/5.0039839
DOI (Related Dataset): 10.21979/N9/Z0T9TH
Schools: School of Physical and Mathematical Sciences 
Departments: Division of Physics and Applied Physics
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
Rights: © 2021 Author(s). All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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