High harmonics generation in gases near the gratings: towards the spectrum enhancement and enrichment

Abstract

Abstract The problem of harmonic generation efficiency (as an example of non-linear optical phenomena) increasing by atomic media near the surface of a one-dimensional metal diffraction grating under conditions of plasmon resonance excitation is considered. The local field enhancement factor dependences on diffraction grating profile are studied. Spatial distribution of the femtosecond pulse electric field strength over the grating surface under conditions of plasmon resonance excitation is simulated. Generated harmonic efficiency enhancement and photoemission spectra enrichment (due to laser field strength amplification near the grating) are discussed.