Experimental demonstration of topological slow light waveguides in valley photonic crystals

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

Research output: Contribution to journalArticlepeer-review

Abstract

We experimentally demonstrate topological slow light waveguides in valley photonic crystals (VPhCs). We employed a bearded interface formed between two topologically-distinct VPhCs patterned in an air-bridged silicon slab. The interface supports both topological and non-topological slow light modes below the light line. By means of optical microscopy, we observed light propagation in the topological mode in the slow light regime with a group index ng over 30. Furthermore, we confirmed light transmission via the slow light mode even under the presence of sharp waveguide bends. In comparison between the topological and non-topological modes, we found that the topological mode exhibits much more efficient waveguiding than the trivial one, demonstrating topological protection in the slow light regime. This work paves the way for exploring topological slow-light devices compatible with existing photonics technologies.

Original languageEnglish
Pages (from-to)13441-13450
Number of pages10
JournalOptics Express
Volume29
Issue number9
DOIs
Publication statusPublished - 2021 Apr 26
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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