[13p-N321-1~15] 3.11 Photonic structures and phenomena

[13p-N321-6] Highly-sensitive slot-size dependence of high-Q/V H1 slotted nanocavity

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

We investigate H1 nanocavity with a center sub-wavelength short nano-slot having a nano-slot cavity mode that well focuses electronic field in an antinode fills in the nano-slot and can realize an ultrahigh-Q/V value. Here we reveal both theoretically and experimentally that this high Q/V cavity mode is highly sensitive to the fine shape of the nano-slot. Notably, Q factor depends on both slot length (sl) and slot width (sw) and changes two-dimensionally in sl-sw plane. This is important finding to realize desirable Q factor and/or Q/V value in this nanocavity.