Chiral coupling in gold nanodimers

Husu, H.; Canfield, B. K.; Laukkanen, J.; Bai, B.; Kuittinen, M.; Turunen, J.; Kauranen, M.
November 2008
Applied Physics Letters;11/3/2008, Vol. 93 Issue 18, p183115
Academic Journal
Second-harmonic generation from T-shaped gold nanodimers with nanogaps has different efficiencies for left- and right-hand circularly polarized fundamental light. The difference arises from the chiral symmetry breaking of the dimers due to nonorthogonal mutual orientations of the horizontal and vertical bars of the T shape and depends on the gap size. Unexpectedly, the smallest gap with presumably the strongest coupling gives rise to only a small difference. All results can be explained by considering the distribution of the polarized local field in the structure.


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