Wave mixing and high-harmonic generation enhancement by a two-color field driven dielectric metasurface [Invited]

High-harmonic generation in metasurfaces, driven by strong laser fields, has been widely studied. Compared to plasma, all-dielectric nanoscale metasurfaces possess larger nonlinearity response and higher damage threshold. Additionally, it can strongly localize the driven field, greatly enhancing its peak amplitude. In this work, we adopt a Fano resonant micronano structure with transmission peaks at different wavelengths and explore its nonlinear response by both single and twocolor pump fields. Compared to the high-order harmonics induced by the first resonant wavelength, the intensity of the high-harmonic radiation results is enhanced by one order of magnitude, when the metasurface is driven by various resonant and non-resonant wavelength combinations of a two-color field.

Automated summary

High-harmonic generation in metasurfaces driven by strong laser fields has been widely studied, showing larger nonlinearity response and higher damage threshold compared to plasma. By using two-color pump fields, the intensity of high-harmonic radiation results can be enhanced by one order of magnitude.