Self-organization of filaments from Au particles in transparent solids, stimulated by laser photolysis of incorporated Au precursor

Authors

  • V.N. Bagratashvili,

    Corresponding author
    1. Institute of Laser and Information Technologies, Russian Academy of Sciences, 2, Pionerskaya Str., Moscow Region, Troitsk 142190, Russia
    • Institute of Laser and Information Technologies, Russian Academy of Sciences, 2, Pionerskaya Str., Moscow Region, Troitsk 142190, Russia
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  • N.V. Minaev,

    1. Institute of Laser and Information Technologies, Russian Academy of Sciences, 2, Pionerskaya Str., Moscow Region, Troitsk 142190, Russia
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  • A.O. Rybaltovskii,

    1. Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Leninskiye Gory, Moscow 119991, Russia
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  • V.I. Yusupov

    1. V.I. Il'ichev Pacific Oceanological Institute, Far Eastern Branch of Russian Academy of Sciences, 43, Baltiyskaya Str., Vladivostok 690041, Russia
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Abstract

Continuous wave (CW) laser (473 nm in wavelength, 10–50 mW in power) irradiation of porous glass (Vycor) and polymer (cross-linked olygourethane-methacrylate) samples impregnated with Au precursor (H[AuCl4]·4H2O), stimulates formation of filamentary tracks from Au nanoparticles (5–90 µm in thickness and up to 5 mm in length), which are growing along a laser beam axis. Such filaments are growing both in the course of laser irradiation, and as a result of diffusive post-radiation effects. In Vycor glass sample each single filament represents itself a quasi-periodic sequence of granules composed of Au nanoparticles aggregates 10–30 µm in size, while in polymer sample the granules are non-periodic and are not so clearly pronounced. The observed effect of a low intensity CW laser formation of filaments from Au particles is rationalized by self-organization effects of several types, taking place at the formation of Au nanoparticles (with a strong plasmon resonance) and their micron-sized aggregates. The self-consistent processes of laser light filamentation and growing of filamentary tracks of Au nanoparticles aggregates are clearly revealed in such system. (© 2011 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) (© 2011 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA)

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