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....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.展开更多
基金supported by the National Natural Science Foundation of China(Nos.11774215,91950101,and12074240)Sino-German Mobility Programme(No.M-0031)+2 种基金Department of Education of Guangdong Province(No.2018KCXTD011)High Level University Projects of Guangdong Province(Mathematics,Shantou University)Open Fund of the State Key Laboratory of High Field Laser Physics(SIOM)。
文摘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.
