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Nanoparticles are a favorable way to enhance ionization for ultrashort laser pulse focusing on liquid targets. We experimentally investigate how nanoparticles affect the THz generation from deionized water for different concentrations. However, no obvious enhancement is observed comparing with the signal from deionized water under the same excitation condition. Thus, the concentration of nanoparticles is not a crucial factor to enhance THz wave generation within the order of 10^8~10^11 particles/ml. We believe our results provide useful information on enhancing the liquid THz emission source by nanoparticles
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Fang Ling, Yiwen E., Kareem J. Garriga Francis, Bin Zhang, Xi-Cheng Zhang, "Investigation on THz generation from Influences of gold nanoparticles in water solution," Proc. SPIE 11559, Infrared, Millimeter-Wave, and Terahertz Technologies VII, 1155911 (10 October 2020); https://doi.org/10.1117/12.2575244