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Proceedings Paper

Gap-dependent chiral coupling in T-shaped gold nanodimers
Author(s): Martti Kauranen; Hannu Husu; Brian K. Canfield; Janne Laukkanen; Benfeng Bai; Markku Kuittinen; Jari P. Turunen
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Paper Abstract

The mutual non-orthogonal orientations of its horizontal and vertical bars make T-shaped gold nanodimers chiral. Because of the broken symmetry second-harmonic generation from the structure has different efficiencies for left- and right-hand circularly-polarized fundamental light. The chiral signature arises from the coupling between the bars. One would therefore assume that the chiral signature is largest when the gap size is very small, because then the coupling is presumably the strongest. Counter-intuitively, the measurement results show a very small chiral signature for the smallest gap. To explain the results, one needs to consider the distribution of the local field in the unit cell of the structure.

Paper Details

Date Published: 23 April 2008
PDF: 8 pages
Proc. SPIE 6988, Nanophotonics II, 69880K (23 April 2008); doi: 10.1117/12.780513
Show Author Affiliations
Martti Kauranen, Tampere Univ. of Technology (Finland)
Hannu Husu, Tampere Univ. of Technology (Finland)
Brian K. Canfield, Tampere Univ. of Technology (Finland)
Janne Laukkanen, Univ. of Joensuu (Finland)
Benfeng Bai, Univ. of Joensuu (Finland)
Markku Kuittinen, Univ. of Joensuu (Finland)
Jari P. Turunen, Univ. of Joensuu (Finland)

Published in SPIE Proceedings Vol. 6988:
Nanophotonics II
David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)

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