Laser-Induced Reshaping of Metallodielectric Nanoshells under Femtosecond and Nanosecond Plasmon Resonant Illumination

Carla M. Aguirre,† Cristin E. Moran,‡ James F. Young,§ and Naomi J. Halas*‡§
Department of Physics and Astronomy, Department of Chemistry, Department of Electrical and Computer Engineering, and Rice Quantum Institute, Rice University, P.O. Box 1892, Houston, Texas 77005-1892
J. Phys. Chem. B, 2004, 108 (22), pp 7040–7045
DOI: 10.1021/jp036222b
Publication Date (Web): May 1, 2004
Copyright © 2004 American Chemical Society
†

 Department of Physics and Astronomy.

,
‡

 Department of Chemistry.

,
§

 Department of Electrical and Computer Engineering.

,
*

 To whom correspondence should be addressed. E-mail:  halas@rice.edu.

Abstract

Absorption of pulsed laser light energy at the plasmon resonant wavelength of silica−gold core−shell nanoparticles results in a reshaping of the nanoparticle's metal shell layer. Dramatically distinct and reproducible changes in nanoparticle morphology occur as a function of laser pulse width in the femtosecond versus nanosecond regime and laser fluence. The changes are accompanied by large modifications in the plasmon resonant wavelength and spectrum of the reshaped nanoparticle. At the highest femtosecond pulse energies used, deformation of the silica core is also observed.

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History

  • Published In Issue June 03, 2004
  • Received July 29, 2003
    Revised March 2, 2004

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