Thin 10_100 nm film in contact with substrate: Dynamics after femtosecond laser irradiation

30th International Conference on Interaction of Intense Energy Fluxes with Matter

Khokhlov, V.A.^1 ; Inogamov, N.A.^1 ; Zhakhovsky, V.V.^2 ; Shepelev, V.V.^3 ; Il'Nitsky, D.K.^2

Landau Institute for Theoretical Physics, Russian Academy of Scienses, Akademika Semenova 1a, Chernogolovka, Moscow Region

142432, Russia^1

All-Russia Scientific Research Institute of Automatics, Sushchevskaya 22, Moscow

127055, Russia^2

Institute for Computer-Aided Design, Russian Academy of Sciences, Vtoraya Brestskaya 19/18, Moscow

123056, Russia^3

关键词: Cohesion strength;    Dielectric substrates;    Film substrates;    Fluence thresholds;    Freestanding films;    Glass substrates;    Negative pressures;    Oscillatory mode;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/653/1/012003/pdf
DOI  :  10.1088/1742-6596/653/1/012003

来源: IOP

【 摘 要 】

Femtosecond laser irradiation of a thin gold film deposited on the thick glass substrate is considered. The thickness of a film has the order of a few microns and focal focal spot is small. Underlying physics of processes after irradiation is studied with combined approach of two-temperature hydrodynamic and MD simulations. Found are two adsorbed fluence thresholds Fsaand three regimes of motion, in comparison with the freestanding film. There is oscillatory mode when the film oscillates remaining on substrate for 0 s. For Fsathe film breaks away from substrate because negative pressure overcomes the cohesion strength of the film-substrate contact. For Fa