Presentation Information
[8a-N405-9]Evanescent-field-induced harmonic generation in preionized liquids above the critical plasma density
〇Tomoya Mizuno1, Tianqi Yang1, Takayuki Kurihara1, Yimin Gu1, Tomoyuki Shoji1, Teruto Kanai1, Jiro Itatani1 (1.ISSP, Univ. of Tokyo)
Keywords:
stonrg field physics in liquid
We report the observation of high harmonic generation (HHG) from preionized liquid ethanol and water, driven by intense mid-infrared (MIR) pulses at 3100 nm. Preionization by near-infrared (NIR) pump pulses enables control of electron density. When this density exceeds the critical plasma threshold, the MIR pulse is reflected, forming an evanescent field at the liquid surface. Harmonics generated under this condition exhibit strong spectral narrowing and reduced yield, confirming evanescent-field-induced HHG. Numerical simulations reproduce these features and reveal that harmonic generation is confined to a nanometer-scale region. Our results establish a novel platform for studying strong-field light–matter interaction using a strong evanescent field.