Ultra-high-Q TE/TM dual-polarized photonic crystal nanocavities

TL;DR

This paper presents the design and demonstration of dual-polarized photonic crystal nanocavities supporting high-Q TE and TM modes with tunable frequency separation, enabling advanced nonlinear optical applications.

Contribution

It introduces a novel dual-polarized nanocavity design with ultra-high Q factors and tunable mode separation, advancing integrated nonlinear photonics.

Findings

Both TE and TM modes have Q > 1 million.

Modes exhibit high nonlinear spatial overlap.

Tunable frequency separation demonstrated.

Abstract

We demonstrate photonic crystal nanobeam cavities that support both TE- and TM-polarized modes, each with a Quality factor greater than one million and a mode volume on the order of the cubic wavelength. We show that these orthogonally polarized modes have a tunable frequency separation and a high nonlinear spatial overlap. We expect these cavities to have a variety of applications in resonance-enhanced nonlinear optics.