Implementation of a High-$Q$, Small Mode Volume Cavity in Microfibers Using Lattice-Constant-Varying Nanohole Arrays

We proposed a novel approach to confine light in a silica microfiber (MF) cavity using a lattice constant-varying nanohole array. In our simulation study, the MF cavity is integrated with the optimally designed nanostructure, and produces Q-factors as high as 7 × 10
⁵
in the near-infrared region. The mode volume of the cavity remains close to λe
³
, a much smaller value than those previously reported for MF-based high- Q resonant structures. Our MF cavity with enhanced performance should find many potential applications in fiber lasers, nonlinear fiber optics, cavity quantum electrodynamics (QED), and cavity optomechanics.