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Proceedings Paper

Second-order optical characterization of gold nanoparticle arrays
Author(s): Brian Canfield; Sami Kujala; Kaisa Laiho; Hannu Husu; Konstantins Jefimovs; Yuri Svirko; Jari Turunen; Martti Kauranen
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Paper Abstract

The physical processes underlying the complex nanoscale optical responses of metal nanoparticles must be understood both experimentally and theoretically if they are to be developed for use in photonic devices. While many linear optical measurements have been performed on gold nanoparticle arrays, only a handful of nonlinear measurements have been reported. Here, we discuss a collection of experiments of both types on arrays of gold nanoparticles. However, on nanoscale-rough metal surfaces, such as nanoparticles with small-scale defects, local electric fields may vary rapidly and strong field gradients can induce significant multipolar contributions, making a theoretical description of second-harmonic generation (SHG) from nanoparticle arrays infeasible at present. A macroscopic nonlinear response tensor approach based on the input and output fields to the system avoids with these complications. Contributions from higher multipoles are implicitly included, and electric-dipole-type selection rules can be applied to address symmetry issues. While the experimental geometry constrains the formalism, additional insight into the underlying physical processes is expected from experimental variations. Good agreement with direct SHG tensor measurements validates the formalism, providing the framework for a deeper understanding of the nanoscale optical responses of metal nanoparticles.

Paper Details

Date Published: 20 April 2006
PDF: 9 pages
Proc. SPIE 6195, Nanophotonics, 619503 (20 April 2006); doi: 10.1117/12.662444
Show Author Affiliations
Brian Canfield, Tampere Univ. of Technology (Finland)
Sami Kujala, Tampere Univ. of Technology (Finland)
Kaisa Laiho, Tampere Univ. of Technology (Finland)
Hannu Husu, Tampere Univ. of Technology (Finland)
Konstantins Jefimovs, Univ. of Joensuu (Finland)
Yuri Svirko, Univ. of Joensuu (Finland)
Jari Turunen, Univ. of Joensuu (Finland)
Martti Kauranen, Tampere Univ. of Technology (Finland)

Published in SPIE Proceedings Vol. 6195:
David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)

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