Broadband Topological Slow Light through Higher Momentum-Space Winding

Jonathan Guglielmon, Mikael C. Rechtsman

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Slow-light waveguides can strongly enhance light-matter interaction, but suffer from a narrow bandwidth, increased backscattering, and Anderson localization. Edge states in photonic topological insulators resist backscattering and localization, but typically cross the bulk band gap over a single Brillouin zone, meaning that slow group velocity implies narrow-band operation. Here we show theoretically that this can be circumvented via an edge termination that causes the edge state to wind many times around the Brillouin zone, making it both slow and broadband.

Original languageEnglish (US)
Article number153904
JournalPhysical review letters
Volume122
Issue number15
DOIs
StatePublished - Apr 18 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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