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Tuning Dichroic Plasmon Resonance Modes of Gold Nanoparticles in Optical Thin Films

Authors

  • Lola Gonzalez-García,

    1. Nanotechnology on Surfaces laboratory, Instituto de Ciencia de Materiales de Sevilla (CSIC-US), Avda. Américo Vespucio 49, 41092 Sevilla, Spain
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  • Julian Parra-Barranco,

    1. Nanotechnology on Surfaces laboratory, Instituto de Ciencia de Materiales de Sevilla (CSIC-US), Avda. Américo Vespucio 49, 41092 Sevilla, Spain
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  • Juan Ramón Sanchez-Valencia,

    1. Nanotechnology on Surfaces laboratory, Instituto de Ciencia de Materiales de Sevilla (CSIC-US), Avda. Américo Vespucio 49, 41092 Sevilla, Spain
    Current affiliation:
    1. EMPA, Swiss Federal Laboratories for Materials Science and Technology, nanotech@surfaces Laboratory, Überlandstrasse 129, 8600 Dübendorf, Switzerland
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  • Javier Ferrer,

    1. Centro Nacional de Aceleradores (CNA), Universidad de Sevilla-CSIC, Avenida Thomas A. Edison 7, 41092 Sevilla, Spain
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  • Mari-Cruz Garcia-Gutierrez,

    1. Instituto de Estructura de la Materia (CSIC), Serrano 121, 28006 Madrid, Spain
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  • Angel Barranco,

    Corresponding author
    1. Nanotechnology on Surfaces laboratory, Instituto de Ciencia de Materiales de Sevilla (CSIC-US), Avda. Américo Vespucio 49, 41092 Sevilla, Spain
    • Nanotechnology on Surfaces laboratory, Instituto de Ciencia de Materiales de Sevilla (CSIC-US), Avda. Américo Vespucio 49, 41092 Sevilla, Spain.
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  • Agustín R. Gonzalez-Elipe

    Corresponding author
    1. Nanotechnology on Surfaces laboratory, Instituto de Ciencia de Materiales de Sevilla (CSIC-US), Avda. Américo Vespucio 49, 41092 Sevilla, Spain
    • Nanotechnology on Surfaces laboratory, Instituto de Ciencia de Materiales de Sevilla (CSIC-US), Avda. Américo Vespucio 49, 41092 Sevilla, Spain.
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Abstract

A simple method is presented to tune the gold surface plasmon resonance (SPR) modes by growing anisotropic nanoparticles into transparent SiO2 thin films prepared by glancing angle deposition. In this type of composite film, the anisotropy of the gold nanoparticles, proved by gracing incidence small angle X-ray scattering, is determined by the tilted nanocolumnar structure of the SiO2 host and yields a strong film dichroism evidenced by a change from an intense colored to a nearly transparent aspect depending on light polarization and/or sample orientation. The formation in these films of lithographic non-dichroic SPR patterns by nanosecond laser writing demonstrates the potentialities of this procedure to develop novel optical encryption or anti-counterfeiting structures either at micrometer- or macroscales.

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