Modelling of Ultrafast Laser Surface Interaction


Contact Person(s):
Dr. Emmanuel Stratakis Prof. Costas Fotakis Dr. Giorgos Tsibidis


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The aim of the project is the investigation of the physical fundamentals of the ultrafast laser surface micro and nanopatterning process. A rigorous theoretical investigation is pursued to describe the mechanisms that account for the associated experimental observations after single and multiple-pulse ultrashort pulse irradiation of solid surfaces.

Research Topics
Ultrafast Laser Micro- and Nano- processing

Abstract

A desirable effect in the laser-mater processing applications is to control and influence the morphology of the material surface by regulating the way of energy delivery from the laser into the various degrees of freedom of the system. Femtosecond pulsed laser interaction with matter triggers a variety of timescale-dependent processes, influenced by the fluence and pulse duration. A rigorous theoretical investigation is pursued to describe the physical fundamentals and mechanisms that account for the associated experimental observations after single and multiple-pulse ultrashort pulse irradiation and provide a systematic and controllable way of linking the observed surface modification with the applied conditions. The theoretical investigation of the photoinduced surface morphological effects in a variety of materials aims to provide an understanding of the correlation of electron-lattice interaction and other mechanisms (such as surface plasmon wave generation, hydrodynamics, elasto-plasticity (see Figure below) with macroscopical observables such as morphological modifications. Furthermore, establishment of the underlying mechanism of material micro- and/or nanopatterning potentially opens the way for a novel tool of surface nanopatterning. Figure:Stress components at t;=1ns (a). The radial dependence of stress at three different locations inside the material is illustrated in (b).




Publications

  • From ripples to spikes: a hydro-dynamical physical mechanism to interpret femtosecond laser induced self-assembled structures
    Tsibidis G.D., Fotakis C., and Stratakis E. , Physical Review B, (Rapid Communications), 92 ,041405(R), 2015

  • Thermal response of double-layered metal films after ultrashort-pulsed laser irradiations: the role of nonthermal electron dynamics
    Tsibidis G.D., Applied Physics Letters, 104, 051603, 2014

  • Controlled ultrashort pulse laser induced ripple formation on semiconductors
    Tsibidis G.D., Stratakis E., Loukakos P.A., and Fotakis C., Applied Physics A, Applied Physics A (Invited Paper), 114:57–68, 2014

  • The influence of ultrafast temporal energy regulation on the morphology of Si surfaces through femtosecond double pulse laser irradiation
    Barberoglou M., Tsibidis G.D., Grey D., Magoulakis M., Fotakis C., Stratakis E., and Loukakos P.A., Applied Physics A, Applied Physics A (Rapid Communications), 113, 273-283., 2013

  • Dynamics of ripple formation on silicon surfaces by ultrashort laser pulses in subablation conditions
    G. D. Tsibidis, M. Barberoglou, P. A. Loukakos, E. Stratakis, and C. Fotakis, Physical Review B, v.86, p.115316, 2012

  • Thermoplastic deformation of silicon surfaces induced by ultrashort pulsed lasers in submelting conditions
    Tsibidis, G.D., Stratakis, E., Aifantis, K.E., Journal of Applied Physics, 111 , 053502, 2012

Project Members
Dr. Emmanuel Stratakis
Dr. Panagiotis Loukakos
Prof. Costas Fotakis
Dr. Giorgos Tsibidis



Last Updated:  20/1/2016
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