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: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/153536 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | 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. |
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