Abstract
Nanoparticle mediated laser induced breakdown can be used for Nanoparticle synthesis, cell nanosurgery and laser induced breakdown spectroscopy. To investigate the photo-thermal conversion of gold nanoparticles during pulsed laser irradiation, the electron-phonon two temperature model was established in this study. The impact of laser energy density and pulse width on the thermal conversion and morphology change of gold nanorods were investigated and compared with experimental observations. The results show that the melting threshold of gold nanorods under nanosecond laser irradiation is about twenty times that of femtosecond laser irradiation. The mechanisms of nanorod fragmentation are different between femto and nanosecond laser irradiation: particle melting is more likely to occur in nanosecond laser irradiation, while the Coulomb explosion is highly likely to occur in femtosecond laser irradiation.
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