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Dynamics of optically excited tungsten and silicon for ripples formation

Abstract : We measured the dielectric constant of optically excited silicon and tungsten using a dual-angle femtosecond reflectivity pump-probe technique. The energy deposition in the formation of laser-induced periodic surface structures (LIPSS) is then investigated by simulating the laser pulse interaction with an initially random distributed rough surface using 3D-Finite Difference Time Domain (FDTD) method, with the measured dielectric constant as a material input. We found in the FDTD simulation periodic energy deposition patterns both perpendicular and parallel to the laser polarization. The origin of them are discussed for originally plasmonic and non-plasmonic material.
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Contributor : Razvan Stoian <>
Submitted on : Friday, January 22, 2016 - 4:02:12 PM
Last modification on : Tuesday, December 8, 2020 - 10:30:05 AM




Hao Zhang, Chen Li, Guanghua Cheng, Jean-Philippe Colombier, Razvan Stoian. Dynamics of optically excited tungsten and silicon for ripples formation. Photonics West, Laser-based Micro- and Nanoprocessing IX, SPIE, Feb 2015, San Francisco, United States. pp.0H, ⟨10.1117/12.2076593⟩. ⟨ujm-01260857⟩



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