Low-noise on-chip frequency conversion by four-wave-mixing Bragg scattering in SiNx waveguides

TL;DR

This paper demonstrates low-noise, tunable wavelength conversion in SiNx waveguides using four-wave mixing Bragg scattering, with simulations guiding device design and achieving efficient conversion suitable for quantum light applications.

Contribution

It experimentally demonstrates tunable, low-noise frequency conversion in SiNx waveguides using Bragg scattering, with simulation-based optimization of phase matching.

Findings

Achieved approximately 5% peak conversion efficiency.

Demonstrated tunable wavelength conversion over 5 nm range.

Validated the importance of waveguide geometry for phase matching.

Abstract

Low-noise, tunable wavelength-conversion through non-degenerate four-wave mixing Bragg scattering in SiNx waveguides is experimentally demonstrated. Finite element method simulations of waveguide dispersion are used with the split-step Fourier method to predict device performance, and indicate a strong dependence of the conversion efficiency on phase matching, which is controlled by the waveguide geometry. Two 1550 nm wavelength band pulsed pumps are used to achieve tunable conversion of a 980 nm signal over a range of 5 nm with a peak conversion efficiency of \approx 5 %. The demonstrated Bragg scattering process is suitable for frequency conversion of quantum states of light.