Angle-Dependent Extinction of Anisotropic Silica/Au Core/Shell Colloids Made via Ion Irradiation

Authors

  • J. J. Penninkhof,

    1. Center for Nanophotonics, FOM Institute AMOLF, Kruislaan 407, NL-1098 SJ Amsterdam, The Netherlands
    Search for more papers by this author
  • C. Graf,

    1. Soft Condensed Matter, Debye Institute, Utrecht University, P.O. Box 80000, NL-3508 TA Utrecht, The Netherlands
    2. Present address: Institut für Physikalische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
    Search for more papers by this author
  • T. van Dillen,

    1. Center for Nanophotonics, FOM Institute AMOLF, Kruislaan 407, NL-1098 SJ Amsterdam, The Netherlands
    2. Present address: Applied Physics, University of Groningen, Nijenborgh 4, NL-9747 AG Groningen, The Netherlands.
    Search for more papers by this author
  • A. M. Vredenberg,

    1. Functional Materials, Debye Insitute, Utrecht University, P.O. Box 80000, NL-3508 TA Utrecht, The Netherlands
    Search for more papers by this author
  • A. van Blaaderen,

    1. Soft Condensed Matter, Debye Institute, Utrecht University, P.O. Box 80000, NL-3508 TA Utrecht, The Netherlands
    Search for more papers by this author
  • A. Polman

    1. Center for Nanophotonics, FOM Institute AMOLF, Kruislaan 407, NL-1098 SJ Amsterdam, The Netherlands
    Search for more papers by this author

Errata

This article is corrected by:

  1. Errata: Angle-Dependent Extinction of Anisotropic Silica/Au Core/Shell Colloids Made via Ion Irradiation Volume 18, Issue 21, 2802, Article first published online: 30 October 2006

  • The authors gratefully acknowledge Prof. Dr. L. W. Jenneskens and Dr. C. A. van Walree (UU) for the use of the CARY 5 spectrophotometer. This work is part of the research program of the “Stichting voor Fundamenteel Onderzoek der Materie (FOM)”, which is financially supported by the “Nederlandse organisatie voor Wetenschappelijk Onderzoek (NWO)”. J. J. Penninkhof and C. Graf contributed equally to the work.

Abstract

original image

Spherical colloids with silica cores (300–500 nm diameter) and gold shells (20–60 nm thickness) are shown to deform to form oblate ellipsoids under ion-beam irradiation, as shown in the Figure. The deformation, which can be controlled by ion fluence, is attributed to an ion-induced anisotropic deformation in the amorphous silica that is constrained mechanically by the gold shell. The optical extinction of these samples is highly angle-dependent.

Ancillary