Abstract
Structural evolution of gold–carbon allotrope nano-composite films under relativistically intense, ultra-short laser pulse irradiation is studied in this work. Au–C nano-composite films, having 4 and 10at.% of Au, were deposited by co-sputtering technique on silicon substrates. Au–C60 NC films with 2.5at.% Au were deposited on 12μm thick Al foil using co-evaporation technique. These samples were radiated with single pulse from 45fs, 10 TW Ti:Sapphire Laser at RRCAT at an intensity of 3×1018Wcm−2. The morphological and compositional changes were investigated using scanning electron microscopy (SEM) and Rutherford back-scattering spectrometry (RBS) techniques. Laser pulse created three morphologically distinct zones around the point of impact on samples with silicon substrates. The gold content in 600μm circular region around a point of impact is found to reduce by a factor of five. Annular rings of ∼70nm in diameter were observed in case of Au–C NC film after irradiation. Laser pulse created a hole of about 400μm in the sample with Al foil as substrate and wavy structures of 6μm wavelength are found to be created around this hole. The study shows radial variation in nano-structure formation with varying local intensity of laser pulse.
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