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Poster communications

Structures formed by ultra-short laser interactions with silicon and silica

Abstract : We present an analysis of structure formation on silicon surface [1-3] and in silica by femtosecond laser pulses. We demonstrate the transient evolution of the density of the excited carriers and temperature evolution. To analyse surface structures, conditions required for the excitation of surface plasmon polaritons are revealed for Si. The periods of the resulting ripple structures are then investigated as a function of laser parameters, such as the angle of incidence, laser fluence, and polarization. With an increase in the number of laser shots, the ripple structure changes. First, lines of perpendicular nanoholes appear due to the change in the electro-magnetic field by ripples. Finally, structures of the “black-silicon” type are obtained that are of interest for solar-cell development, changing of wetting properties, and other applications. For silica, we couple Maxwell equations with electronic excitations and obtain free carrier generation regions that affect the field. The process of plasma generation due to multiphoton absorption near small defect in fused silica is studied in details and local field distribution around the void inhomogeneity is explained [4]. References [1] R. Torres et al. , Journal of Optoelectronics and Advanced Materials Vol. 12, No. 3, 2010, Pages 621 – 625 [2] T. Derrien et al. Journal of Applied Physics, 2013 [3] Zhang et al., Optics Letters, 37, 6, 1106-1108, 2012 [4] A. Rudenko et al., PIERS 2015, in press
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Contributor : Tatiana Itina Connect in order to contact the contributor
Submitted on : Thursday, July 23, 2015 - 2:25:12 PM
Last modification on : Sunday, June 26, 2022 - 12:03:54 PM


  • HAL Id : ujm-01179841, version 1



Tatiana Itina, Derrien Thibault J.-y., Anton Rudenko. Structures formed by ultra-short laser interactions with silicon and silica. Multi-scale modelling of matter under extreme irradiation, Jun 2015, Dublin, Ireland. ⟨ujm-01179841⟩



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