[Tu-A1-C] Topological photonics

10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)

[Tu-A1-C-04] Merging Unidirectional Guided Resonances in Photonic Crystal Waveguides

〇Sae Rylie Endo¹, Taiyu Okajima¹, Takahiro Ito¹, Siyuan Gao¹, Hironobu Yoshimi¹, Kenta Takata², Takahiro Uemura^3,4, Masaya Notomi^3,4,5, Satoshi Iwamoto⁶, Yasutomo Ota¹ (1. Keio Univ. (Japan), 2. NTT Research, Inc. (USA), 3. Inst. of Sci. Tokyo (Japan), 4. NTT BRL, NTT Corp. (Japan), 5. Nanophotonics Center, NTT Corp. (Japan), 6. The Univ. of Tokyo (Japan))

Unidirectional guided resonances (UGRs) are topological defect states exhibiting unidirectional radiation. Here, we report "merged UGRs" in photonic crystal waveguides. We observed an additive coalescence of two interband-coupling-induced UGRs, resulting in an extended UGR in momentum space.