High-harmonic generation from subwavelength silicon films.

ABSTRACT: Recent years have witnessed significant developments in the study of nonlinear properties of various materials at the nanoscale. Often, experimental results on harmonic generation are reported without the benefit of suitable theoretical models that allow assessment of conversion efficiencies compared to the material's intrinsic properties. Here, we report experimental observations of even and odd harmonics up to the 7th, generated from a suspended subwavelength silicon film resonant in the UV range at 210 nm, the current limit of our detection system, using peak power densities of order 3 TW/cm². We also highlight the time-varying properties of the dielectric function of silicon, which exhibits large changes under intense illumination. We explain the experimental data wit

SUBMITTER: Hallman K 

PROVIDER: S-EPMC12617717 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature