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Proceedings Article

Gap-dependent chiral coupling in T-shaped gold nanodimers

[+] Author Affiliations
Martti Kauranen, Hannu Husu, Brian K. Canfield

Tampere Univ. of Technology (Finland)

Janne Laukkanen, Benfeng Bai, Markku Kuittinen, Jari P. Turunen

Univ. of Joensuu (Finland)

Proc. SPIE 6988, Nanophotonics II, 69880K (April 23, 2008); doi:10.1117/12.780513
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From Conference Volume 6988

  • Nanophotonics II
  • David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf
  • Strasbourg, France | April 07, 2008

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.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Martti Kauranen ; Hannu Husu ; Brian K. Canfield ; Janne Laukkanen ; Benfeng Bai, et al.
"Gap-dependent chiral coupling in T-shaped gold nanodimers", Proc. SPIE 6988, Nanophotonics II, 69880K (April 23, 2008); doi:10.1117/12.780513; http://dx.doi.org/10.1117/12.780513


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