[24a-E301-1~10] 3.11 Photonic structures and phenomena

[24a-E301-8] Expanding ultrahigh-Q r/a range of L3 nanocavity by large-scale automated optimization

〇Eiichi Kuramochi^1,2, Shota Kita^1,2, Akihiko Shinya^1,2, Masaya Notomi^1,2 (1.NTT-NPC, 2.NTT-BRL)

Keywords:photonic crystal, optical nanocavity, photonics chip

Optimization of L3 nanocavity for ultrahigh-Q factor was studied around photonic crystal parameter setting of r/a~ 0.25 and a ~ 400 nm. To expand the ultrahigh-Q factor range of L3 nanocavity must be useful for cavity tuning and various applications. Here we report experimental demonstration of significant Q factor enhancement of L3 nanocavities by automated optimization of multiple hole positions at r/a far below/above 0.25.