[19a-B301-1~11] 3.6 Ultrashort-pulse and high-intensity lasers

△ [19a-B301-6] High harmonic generation in solids with resonant nanoantennas (II)

〇(D)Kotaro Imasaka¹, Tomohiro Kaji¹, Tsutomu Shimura¹, Satoshi Ashihara¹ (1.IIS, The Univ. of Tokyo)

Keywords:High harmonic generation, Plasmonic enhanced field, Ultra-short pulse

We work on control and analysis of high harmonic generation (HHG) in solids induced by nano-enhanced electric field utilizing the design freedom of infrared-resonant nano-antenna. We observed higher and stronger harmonic generation (9th-order light at highest, with the efficiency ~10^(-13)) by irradiating Au antenna on ZnO crystal with femto-second laser pulse (2 um in wavelength) compared with bulk ZnO. In addition, we observed both odd and even (only odd) harmonics with antenna along c- (m-) axis, which indicates that nano-enhanced HHG reflects the symmetry of bulk HHG.