Topological slow light via coupling chiral edge modes with flat bands

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, thi...

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Main Authors: Yu, Letian, Xue, Haoran, Zhang, Baile
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/153536
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1535362023-02-28T19:55:15Z Topological slow light via coupling chiral edge modes with flat bands Yu, Letian Xue, Haoran Zhang, Baile School of Physical and Mathematical Sciences Division of Physics and Applied Physics Centre for Disruptive Photonic Technologies (CDPT) Science::Physics::Optics and light Topology Brillouin Zones 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. Ministry of Education (MOE) Published version This work was supported by the Singapore MOE Academic Research Fund Tier 3 Grant No. MOE2016-T3-1-006, Tier 1 Grant Nos. RG187/18 and RG174/16(S), and Tier 2 Grant No. MOE 2018-T2-1-022(S). 2021-12-07T02:59:42Z 2021-12-07T02:59:42Z 2021 Journal Article Yu, L., Xue, H. & Zhang, B. (2021). Topological slow light via coupling chiral edge modes with flat bands. Applied Physics Letters, 118(7), 071102-. https://dx.doi.org/10.1063/5.0039839 0003-6951 https://hdl.handle.net/10356/153536 10.1063/5.0039839 2-s2.0-85100875702 7 118 071102 en MOE2016‐T3‐1‐006 MOE2018‐T2‐1‐022 (S) RG174/16 (S) RG187/18 Applied Physics Letters 10.21979/N9/Z0T9TH © 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). application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics::Optics and light
Topology
Brillouin Zones
spellingShingle Science::Physics::Optics and light
Topology
Brillouin Zones
Yu, Letian
Xue, Haoran
Zhang, Baile
Topological slow light via coupling chiral edge modes with flat bands
description 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.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Yu, Letian
Xue, Haoran
Zhang, Baile
format Article
author Yu, Letian
Xue, Haoran
Zhang, Baile
author_sort Yu, Letian
title Topological slow light via coupling chiral edge modes with flat bands
title_short Topological slow light via coupling chiral edge modes with flat bands
title_full Topological slow light via coupling chiral edge modes with flat bands
title_fullStr Topological slow light via coupling chiral edge modes with flat bands
title_full_unstemmed Topological slow light via coupling chiral edge modes with flat bands
title_sort topological slow light via coupling chiral edge modes with flat bands
publishDate 2021
url https://hdl.handle.net/10356/153536
_version_ 1759853049525829632