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Proceedings Paper

Time-resolved second-harmonic generation from gold nanoparticle arrays
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Paper Abstract

We have studied the effects of planar inversion symmetry and particle-coupling of gold nanoparticle (NP) arrays by angle dependent second-harmonic generation (SHG). Time- and angle- resolved measurements were made using a mode-locked Ti:sapphire 800 nm laser onto gold NP arrays with plasmon resonance tuned to match the laser wavelength in order to produce maximum SHG signal. Finite-difference time domain simulations are used to model the near-field distributions for the various geometries and compared to experiment. The arrays were fabricated by focused ion-beam lithography and metal vapor deposition followed by standard lift-off protocols, producing NPs approximately 20nm high with various in-plane dimensions and interparticle gaps. Above a threshold fluence of ~ 7.3 × 10-5 mJ/cm2 we find that the SHG scales with the third power of intensity, rather than the second, and atomic-force microscopy shows that the NPs have undergone a reshaping process leading to more nearly spherical shapes.

Paper Details

Date Published: 22 September 2007
PDF: 10 pages
Proc. SPIE 6641, Plasmonics: Metallic Nanostructures and Their Optical Properties V, 664112 (22 September 2007); doi: 10.1117/12.735337
Show Author Affiliations
D. W. Ferrara, Vanderbilt Univ. (United States)
K. A. Tetz, Vanderbilt Univ. (United States)
M. D. McMahon, Vanderbilt Univ. (United States)
R. F. Haglund Jr., Vanderbilt Univ. (United States)

Published in SPIE Proceedings Vol. 6641:
Plasmonics: Metallic Nanostructures and Their Optical Properties V
Mark I. Stockman, Editor(s)

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