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Proceedings Paper

Exceptional linear and nonlinear optical properties of low-symmetry metal nanoparticle arrays
Author(s): Brian K. Canfield; Sami Kujala; Konstantins Jefimovs; Tuomas Vallius; Jari Turunen; Martti Kauranen
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Paper Abstract

Recent interest in the study of metal nanoparticles and related structures has greatly increased. Technologies such as electron beam lithography facilitate the fabrication of such subwavelength structures. Much research has focused on the linear optical properties of high-symmetry particles, such as ellipsoids and spheroids. However, we focus on both the linear and nonlinear optical responses of low-symmetry L-shaped nanoparticles. We show that these nanoparticle arrays are exceptionally sensitive to polarization. Small asymmetries in the particle shapes lead to large deviations in the primary extinction directions from expected locations. The structural asymmetries may also induce optical activity. We present results of detailed polarization analysis through second-harmonic generation experiments that are based on symmetry arguments regarding the second-order susceptibility tensor. The results confirm that the structural deviations from the ideal shape lead to further breakdown in the symmetry properties of the arrays.

Paper Details

Date Published: 19 October 2004
PDF: 10 pages
Proc. SPIE 5512, Plasmonics: Metallic Nanostructures and Their Optical Properties II, (19 October 2004); doi: 10.1117/12.555762
Show Author Affiliations
Brian K. Canfield, Tampere Univ. of Technology (Finland)
Sami Kujala, Tampere Univ. of Technology (Finland)
Konstantins Jefimovs, Univ. of Joensuu (Finland)
Tuomas Vallius, InPhotonics Ctr. (Finland)
Jari Turunen, Univ. of Joensuu (Finland)
Martti Kauranen, Tampere Univ. of Technology (Finland)

Published in SPIE Proceedings Vol. 5512:
Plasmonics: Metallic Nanostructures and Their Optical Properties II
Naomi J. Halas; Thomas R. Huser, Editor(s)

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