Slow light waveguides in topological valley photonic crystals

Hironobu Yoshimi, Takuto Yamaguchi, Yasutomo Ota, Yasuhiko Arakawa, Satoshi Iwamoto

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


Valley photonic crystals (VPhCs) are an attractive platform for the implementation of topologically protected optical waveguides in photonic integrated circuits (PICs). The realization of slow light modes in the topological waveguides may lead to further miniaturization and functionalization of the PICs. In this Letter, we report an approach to realize topological slow light waveguides in semiconductor-slab-based VPhCs. We show that a bearded interface of two topologically distinct VPhCs can support topological kink modes with large group indices over 100 within the topological bandgap. We numerically demonstrate robust light propagation in the topological slow light waveguide with large group indices of ∼60, even under the presence of sharp bends. Our work opens a novel route to implement topological slow light waveguides in a way compatible with current PIC technology.

Original languageEnglish
Pages (from-to)2648-2651
Number of pages4
JournalOptics Letters
Issue number9
Publication statusPublished - 2020 May 1
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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