Spectral tuning of multimode three-dimensional photonic crystal cavities for enhanced anti-Stokes Raman scattering

TL;DR

This paper presents a method for tuning multimode 3D photonic crystal cavities to enhance anti-Stokes Raman scattering by adjusting their spectral properties through material and geometric modifications.

Contribution

It introduces a spectral tuning approach for multimode 3D photonic crystal cavities, enabling precise control of mode frequencies for nonlinear optical applications.

Findings

Achieved simultaneous tuning of multiple cavity modes

Demonstrated control over spectral spacing based on symmetry and geometry

Validated tuning method through Maxwell's equations simulations

Abstract

Multimode hollow microcavities in three-dimensional (3D) photonic crystals (PhCs) are designed for achieving enhanced coherent anti-Stokes Raman scattering, which requires a cavity to have three high quality-factor (Q) modes with equally spaced resonant frequencies. Cavities in 3D PhCs allows more flexibility in design and tuning than their 2D slab counterparts, since radiation loss that degrades Q can be suppressed by the 3D photonic band gap. We first tune all the mode frequencies simultaneously by changing the material and geometry of the cavity based on perturbation theory. Spectral spacings between the multiple modes are adjusted according to the symmetry, volume and field distribution of their mode profiles. The frequency and field distribution of the resonant modes are computed by solving Maxwell's equations in the frequency domain.