Enhancement of X-ray emission from nanocolloidal gold suspensions under double-pulse excitation
Wei-Hung Hsu1, Frances Camille P Masim1, Armandas Balčytis2
1Research Center for Applied Sciences, Academia Sinica, Nankang, Taipei 11529, Taiwan.
Abstract:
Enhancement of X-ray emission was observed from a micro-jet of a nano-colloidal gold suspension in air under double-pulse excitation of ultrashort (40 fs) near-IR laser pulses. Temporal and spatial overlaps between the pre-pulse and the main pulse were optimized for the highest X-ray emission. The maximum X-ray intensity was obtained at a 1-7 ns delay of the main pulse irradiation after the pre-pulse irradiation with the micro-jet position shifted along the laser beam propagation. It was revealed that the volume around gold nanoparticles where the permittivity is near zero, ε ≈ 0, accounts for the strongest absorption, which leads to the effective enhancements of X-ray emission.
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