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Proceedings Paper

Linear and nonlinear chiral responses from arrays of gold nanoparticles
Author(s): Brian Canfield; Sami Kujala; Kaisa Laiho; Konstantins Jefimovs; Jari Turunen; Martti Kauranen
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Paper Abstract

Considerable attention is devoted to determining and refining the optical properties of metal nanoparticle arrays. The evolution of nanofabrication techniques towards miniaturizing optoelectronic devices naturally suggests the possibility of using such arrays in nanoscale optical components. However, small-scale defects (tens of nanometers or less) in individual particles themselves may exert a significant influence on the overall optical responses of the array, especially when the particles (and/or arrays) appear symmetric on the scale of the particle (and/or array). We have observed strong linear and nonlinear chiral responses from regular arrays of lithographically-designed, low-symmetry, L-shaped gold nanoparticles (~ 200 nm arm lengths) through polarization azimuth rotation and circular difference measurements. Second-harmonic generation measurements exhibit much larger circular difference responses, being more sensitive to symmetry. Comparisons between arrays of symmetric and asymmetric particles imply that the small defects may be the primary source of broken symmetry and hence chirality.

Paper Details

Date Published: 26 August 2005
PDF: 9 pages
Proc. SPIE 5927, Plasmonics: Metallic Nanostructures and Their Optical Properties III, 59270C (26 August 2005); doi: 10.1117/12.614789
Show Author Affiliations
Brian Canfield, Tampere Univ. of Technology (Finland)
Sami Kujala, Tampere Univ. of Technology (Finland)
Kaisa Laiho, Tampere Univ. of Technology (Finland)
Konstantins Jefimovs, Univ. of Joensuu (Finland)
Jari Turunen, Univ. of Joensuu (Finland)
Martti Kauranen, Tampere Univ. of Technology (Finland)

Published in SPIE Proceedings Vol. 5927:
Plasmonics: Metallic Nanostructures and Their Optical Properties III
Mark I. Stockman, Editor(s)

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