Quasi-phase-matched high harmonic generation in corrugated micrometer-scale waveguides

TL;DR

This paper demonstrates how periodically corrugated micrometer-scale waveguides can enhance high harmonic generation through plasmonic effects and quasi-phase-matching, leading to increased efficiency with low pump intensities.

Contribution

It introduces a numerical study of high harmonic generation in corrugated waveguides, highlighting the combined effects of plasmonic enhancement and quasi-phase-matching for efficiency improvement.

Findings

Plasmonic field enhancement reduces required pump intensities.

Periodic corrugations enable quasi-phase-matching.

Optimized waveguide geometry improves harmonic spectra.

Abstract

The high harmonic generation in periodically corrugated submicrometer waveguides is studied numerically. Plasmonic field enhancement in the vicinity of the corrugations allows to use low pump intensities. Simultaneously, periodic placement of the corrugations leads to quasi-phase-matching and corresponding increase of the high harmonic efficiency. The optimization of waveguide geometry is performed, and the resulting spectra are analyzed by the means of (1+1)D numerical model.