Second harmonic generation in phase matched aluminum nitride waveguides

TL;DR

This paper demonstrates efficient second harmonic generation in aluminum nitride waveguides with phase matching, achieving on-chip visible light generation and measuring a significant nonlinear susceptibility, advancing integrated nonlinear optics.

Contribution

It introduces a novel aluminum nitride nanophotonic platform with phase matched resonators for efficient second harmonic generation on a chip.

Findings

Achieved up to 0.5 μW of visible light generation.

Measured second-order nonlinear susceptibility of 4.7 pm/V.

Demonstrated phase matching in aluminum nitride waveguides.

Abstract

We demonstrate second order optical nonlinearity in aluminum nitride on insulator substrates. Using sputter-deposited aluminum nitride thin films we realize nanophotonic waveguides coupled to micro-ring resonators that simultaneously support cavity resonant modes for both visible and IR light. By using phase matched ring resonators, we achieve efficient second-harmonic generation and are able to generate up to 0.5uW of visible light on the chip with a conversion efficiency of -46dB. From the measured response we obtain a second order non-linear susceptibility (\c{hi}2) of 4.7pm/V. Our platform provides a viable route for realizing wideband linear and nonlinear optical devices on a chip.