Silicon nanostructures for efficient high-harmonic generation

The discovery of generating high harmonics (HHG) in solids opens the way for their amplification in nanostructures. Plasmon-enhanced HHG from metallic antennas has been reported on Si [1] . Metallic structures suffer from high absorption and associated heat generation. On the contrary all dielectric nanostructures [2] , [3] can benefit from higher transparency for the fundamental pulse and higher damage threshold. We propose two types of silicon nanostructures, nanostructured cone and novel technique for HHG enhancement based on anapole mode in silicon nanodisk.