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Self-limited underdense microplasmas in bulk silicon induced by ultrashort laser pulses

Abstract : Two-photon ionization by focused femtosecond laser pulses initiates the development of micrometer-scale plasmas in the bulk of silicon. Using pump-and-probe transmission microscopy with infrared light, we investigate the space-time characteristics of these plasmas for laser intensities up to 10(12) W/cm(2). The measurements reveal a self-limitation of the excitation at a maximum free-carrier density of congruent to 10(19) cm(-3), which is more than one order of magnitude below the threshold for permanent modification. The plasmas remain unchanged in the similar to 100 ps timescale revealing slow carrier kinetics. The results underline the limits in local control of silicon dielectric permittivity, which are inherent to the use of single near-infrared ultrashort Gaussian pulses. (C) 2014 AIP Publishing LLC.
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https://hal.archives-ouvertes.fr/hal-01418550
Contributor : Gaëlle Coustillier <>
Submitted on : Friday, December 16, 2016 - 5:40:42 PM
Last modification on : Monday, March 29, 2021 - 3:14:09 PM

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Alexandros Mouskeftaras, Andrei V. Rode, Raphael Clady, Marc Sentis, Olivier Uteza, et al.. Self-limited underdense microplasmas in bulk silicon induced by ultrashort laser pulses. Applied Physics Letters, American Institute of Physics, 2014, 105 (19), ⟨10.1063/1.4901528⟩. ⟨hal-01418550⟩

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