THERMAL RESPONSE OF SILICON CRYSTAL TO PICO-FEMTOSECOND HEAT PULSE BY MOLECULAR DYNAMICS |
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Authors: | Sebastian Volz Remi Carminati Karl Joulain |
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Affiliation: | 1. EM2C Laboratory, UPR CNRS 288, Ecole Centrale Paris, Chatenay-Malabry, France;2. LET, UMR CNRS 6608, ENSMA, Futuroscope Cedex, France |
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Abstract: | We investigate the thermal response of a silicon crystal irradiated by a pico-femto heat pulse by using molecular dynamics technique and a linear response theory–based statistical analysis. The thermal susceptibility is first defined in terms of computed quantities and then convoluted with time Gaussian temperature pulses. The qualitative difference between the responses to various pulse durations is explained and the results are compared to those of classical Fourier model. Non-Fourier behaviors are emphasized and a mean phonon relaxation time is identified. |
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Keywords: | short–time heat conduction phonon relaxation time femtosecond laser |
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