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Plasmonics

, Volume 5, Issue 3, pp 241–250 | Cite as

Tunable In-Plane Optical Anisotropy of Ag Nanoparticles Deposited by DC Sputtering onto SiO2 Nanocolumnar Films

  • Juan Ramon Sánchez-Valencia
  • Johann Toudert
  • Ana Borras
  • Carmen López-Santos
  • Angel Barranco
  • Inés Ortega Feliu
  • Agustin Rodriguez González-Elipe
Article

Abstract

This work reports an easy-to-handle method for growing two-dimensional assemblies of Ag nanostructures presenting a tunable in-plane optical anisotropy. Ag is deposited by DC sputtering in an Ar plasma at room temperature onto bundled nanocolumnar SiO2 thin films grown by glancing angle physical vapor deposition. In contrast with previously reported processes involving the grazing angle deposition of the metal, DC sputtering is performed at normal incidence. By varying the deposition angle of SiO2 and the Ar pressure, it was possible to tune the deposited amount of Ag and thus the topology of the Ag deposit from isolated spherical Ag nanoparticles with isotropic optical properties to strongly dichroic Ag nanostripes oriented along the bundling direction of the SiO2 nanocolumns. Based on simple calculations taking into account the shadowing effects during metal deposition, it is proposed that the width and shape of the tip of the bundled SiO2 nanocolumns influence significantly the metal local atom flux arriving to them and thus the final structure of the deposit.

Keywords

Silver nanoparticles Nanostripes Nanochains Nanocolumnar silicon dioxide Plasmonic dichroism 

Notes

Acknowledgments

The authors thank the European Union (STREP Project PHODYE, contract no. 033793), the Spanish Ministry of Research and Innovation (Juan de la Cierva Grant JCI-2009-05098 for J.T., projects MAT2007-65764 and CONSOLIDER INGENIO 2010-CSD2008-00023), and the Junta de Andalucia (project TEP2275) for financial support. The help of the “Domingo Martinez” Foundation is also recognized.

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Juan Ramon Sánchez-Valencia
    • 1
  • Johann Toudert
    • 1
  • Ana Borras
    • 2
  • Carmen López-Santos
    • 1
  • Angel Barranco
    • 1
  • Inés Ortega Feliu
    • 3
  • Agustin Rodriguez González-Elipe
    • 1
  1. 1.Instituto de Ciencia de Materiales de SevillaCentro de Investigaciones de la Isla de la Cartuja, CSICSevillaSpain
  2. 2.Nanotech Surfaces Laboratory, EmpaSwiss Federal Laboratories for Materials Testing and ResearchThunSwitzerland
  3. 3.Centro Nacional de AceleradoresUniversidad de SevillaSevillaSpain

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