Squeezed-light generation in a nonlinear planar waveguide with a periodic corrugation

TL;DR

This paper investigates how a small periodic corrugation in a nonlinear planar waveguide can enhance squeezed-light generation through phase-matched two-mode nonlinear interactions, leading to improved squeezing and intensity.

Contribution

It introduces a method to optimize parameters for enhanced squeezed-light generation in waveguides with surface corrugation, surpassing traditional quasi-phase-matching techniques.

Findings

Enhanced squeezing and intensity achieved with surface corrugation.

Conditions for phase matching in corrugated waveguides derived.

Optimization procedure for parameters provided.

Abstract

Two-mode nonlinear interaction (second-harmonic and second-subharmonic generation) in a planar waveguide with a small periodic corrugation at the surface is studied. Scattering of the interacting fields on the corrugation leads to constructive interference that enhances the nonlinear process provided that all the interactions are phase matched. Conditions for the overall phase matching are found. Compared with a perfectly quasi-phase-matched waveguide, better values of squeezing as well as higher intensities are reached under these conditions. Procedure for finding optimum values of parameters for squeezed-light generation is described.