Bright Second Harmonic Emission from Photonic Crystal Vertical Cavity

TL;DR

This paper demonstrates a significant enhancement in second harmonic generation efficiency using a photonic crystal vertical cavity with a lithium niobate membrane, enabling more effective nonlinear optical devices.

Contribution

The study introduces a novel photonic crystal vertical cavity design that achieves high SHG efficiency of 0.28%, surpassing previous limitations.

Findings

Achieved 0.28% SHG efficiency in the cavity.

High quality resonances observed in the structure.

Potential for compact laser frequency converters.

Abstract

We present a study on photonic vertical cavities consisting of nonlinear materials embedded in photonic crystals (PhCs) for resonantly enhancing second harmonic generation (SHG). Previous attempts at SHG in such structures have been limited to efficiencies of 10$^{-7}$ to 10$^{-5}$, but we demonstrate here a high SHG efficiency of 0.28% by constructing a vertical cavity with a lithium niobate membrane placed between two PhCs, which exhibits high quality resonances. Our results open up new possibilities for compact laser frequency converters that could have a revolutionary impact on the fields of nonlinear optics and photonics.