[A-10] Integrated Photonic Devices

[A-10-01] Demonstration of an Efficient Light Coupler to a Valley Photonic Crystal Waveguide Formed at a Bearded Interface

〇Hironobu Yoshimi^1,2, Takuto Yamaguchi^1,2, Satomi Ishida^1,2, Yasutomo Ota^3,4, Satoshi Iwamoto^1,2,4 (1. RCAST, The Univ. of Tokyo (Japan), 2. IIS, The Univ. of Tokyo (Japan), 3. Keio Univ. (Japan), 4. NanoQuine, The Univ. of Tokyo (Japan))

Presentation style: On-site (in-person)

https://doi.org/10.7567/SSDM.2022.A-10-01

We demonstrate an efficient light coupler between a valley photonic crystal waveguide formed at a bearded interface and a wire waveguide. Numerically calculated coupling loss is less than 1 dB/coupler. We fabricated the couplers in a Si slab and experimentally observed a low coupling loss of 1.1 dB/coupler. These results will lay ground work for low-loss photonic circuits with topological waveguides.