Katharina Schneider, Yannick Baumgartner, et al.
Optica
We describe the design, fabrication, and characterization of a one-dimensional silicon photonic crystal cavity in which a central slot is used to enhance the overlap between highly localized optical and mechanical modes. The optical mode has an extremely small mode volume of 0.017 (λ vac/n)3, and an optomechanical vacuum coupling rate of 310 kHz is measured for a mechanical mode at 2.69 GHz. With optical quality factors up to 1.2 × 105, fabricated devices are in the resolved-sideband regime. The electric field has its maximum at the slot wall and couples to the in-plane breathing motion of the slot. The optomechanical coupling is thus dominated by the moving-boundary effect, which we simulate to be six times greater than the photoelastic effect, in contrast to most structures, where the photoelastic effect is often the primary coupling mechanism.
Katharina Schneider, Yannick Baumgartner, et al.
Optica
Nikolai Kuznetsov, Alberto Nardi, et al.
OFC 2024
Viacheslav Snigirev, Annina Riedhauser, et al.
ECOC 2022
Mikhail Churaev, Rui Ning Wang, et al.
Nature Communications