Efficient light couplers to topological slow light waveguides in valley photonic crystals

Hironobu Yoshimi, Takuto Yamaguchi, Satomi Ishida, Yasutomo Ota, Satoshi Iwamoto

Research output: Contribution to journalArticlepeer-review

Abstract

We numerically and experimentally demonstrate efficient light couplers between topological slow light waveguides in valley photonic crystals (VPhCs) and wire waveguides. By numerical simulations, we obtained a high coupling efficiency of −0.84 dB/coupler on average in the slow light regime of a group index ng = 10 − 30. Experimentally, we fabricated the couplers in a Si slab and measured the transmitted power of the devices. We realized a high coupling efficiency of approximately −1.2 dB/coupler in the slow light region of ng = 10 − 30, which is close to the result from the numerical simulations. These demonstrations will lay the groundwork for low-loss photonic integrated circuits using topological slow light waveguides.

Original languageEnglish
Pages (from-to)6382-6390
Number of pages9
JournalOptics Express
Volume32
Issue number4
DOIs
Publication statusPublished - 2024 Feb 12

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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