Open Access Nano Express

Near-field optical microscopy of femtosecond-laser-reshaped silver nanoparticles in dielectric matrix

Moritz Beleites1*, Christian Matyssek12, Hans-Helmuth Blaschek3 and Gerhard Seifert4

Author Affiliations

1 Physics Institute, Martin Luther University of Halle-Wittenberg, D-06099, Germany

2 Max Planck Institute of Microstructure Physics, , D-06120, Germany

3 Fraunhofer Institute for Mechanics of Materials, IWM Halle, , D-06120, Walter-Hülse-Straße 1, Germany

4 Centre for Innovation Competence SiLi-nano, Martin Luther University of Halle-Wittenberg, D-06099, Germany

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Nanoscale Research Letters 2012, 7:315  doi:10.1186/1556-276X-7-315

Published: 19 June 2012

Abstract

Samples containing single silver nanoparticles have been irradiated by intense femtosecond laser pulses to gain a persistent transformation of their shape to ellipsoidal forms. Irradiated and non-irradiated regions of these samples have been analyzed by microscope spectrometry as well as near-field scanning optical microscopy (NSOM) with several wavelengths and different linear polarizations. The results show the outstanding capability of NSOM technique to detect the individual shape of transformed metallic nanoparticles and to analyze their orientation and aspect ratio.

Keywords:
NSOM; Nanoparticles; Silver; Surface plasmon resonance; 68.37.Uv; 78.67.Bf; 61.46.Df.