Observation of resonance-enhanced high-order harmonics from direct excitation of metal nanoparticles with femtosecond pulses
Jingguang LiangGPL, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, ChinaYu Hang LaiUniversity of Chinese Academy of Sciences, Beijing 100049, ChinaWufeng FuUniversity of Chinese Academy of Sciences, Beijing 100049, ChinaYuwei ShanUniversity of Chinese Academy of Sciences, Beijing 100049, ChinaWeili YuUniversity of Chinese Academy of Sciences, Beijing 100049, ChinaChunlei GuoThe Institute of Optics, University of Rochester, Rochester, New York 14627, USA
2020en
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We report on the observation of resonance enhanced high-order harmonic generation (HHG) from a dense medium composed of indium or tin nanoparticles. Unlike previous studies of resonance enhanced high harmonics from laser produced plasma plume from a prepulse, we generate HHG directly, thus eliminating the undesired contributions from various components in the plasma. We discuss the mechanisms for our observed resonance effect in the absence of preionized particles and the implications of the experimental results on the HHG mechanism in metal nanoparticles.
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