7 March 2014 Laser-induced periodic nanoparticle patterns
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Creating the conditions so that matter naturally self-arranges at the nanoscale under a homogeneous excitation is an exciting challenge for the development of efficient and cost-effective processes. Sub-micrometer periodic templates can be formed spontaneously on materials by low-energy ion sputtering or with lasers. In the latter case, the formation of self-organized grating-like structures requires a high temperature rise and generally results from interactions with ultrashort laser pulses. Recently, a few studies have dealt with self-formed periodic patterns of metal nanoparticle assemblies, but they only reported changes in the spatial and size distributions of metal nanoparticles deposited on surfaces prior to interaction with femtosecond lasers. Here, we show that metal nanoparticles can grow in a selforganized manner within a waveguide illuminated from free-space by a continuous wave visible laser. We report the conditions that give rise to the generation of such 1D nanoparticle gratings and describe the parameters that influence the grating characteristics. We explain the mechanisms involved in the formation of such nanostructures on the basis of interference phenomena between the incident wave and guided modes.
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N. Destouches, N. Destouches, G. Vitrant, G. Vitrant, N. Crespo-Monteiro, N. Crespo-Monteiro, Z. Liu, Z. Liu, Y. Lefkir, Y. Lefkir, F. Vocanson, F. Vocanson, T. Epicier, T. Epicier, "Laser-induced periodic nanoparticle patterns", Proc. SPIE 8969, Synthesis and Photonics of Nanoscale Materials XI, 89690G (7 March 2014); doi: 10.1117/12.2038419; https://doi.org/10.1117/12.2038419

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