Nano Archive

Local field asymmetry drives second-harmonic generation in noncentrosymmetric nanodimers

Canfield, Brian K. and Husu, Hannu and Laukkanen, Janne and Bai, Benfeng and Kuittinen, Markku and Turunen, Jari and Kauranen, Martti (2007) Local field asymmetry drives second-harmonic generation in noncentrosymmetric nanodimers. NANO LETTERS, 7 (5). pp. 1251-1255.

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We demonstrate that second-harmonic generation (SHG) from arrays of noncentrosymmetric T-shaped gold nanodimers with a nanogap arises from asymmetry in the local fundamental field distribution and is not related strictly to nanogap size. Calculations show that the local field contains orthogonal polarization components not present in the exciting field, which yield the dominant SHG response. The strongest SHG responses occur through the local surface susceptibility of the particles for a fundamental field distributed asymmetrically at the particle perimeters. Weak responses result from more symmetric distributions despite high field enhancement in the nanogap. Nearly constant field enhancement persists for relatively large nanogap sizes.

Item Type:Article
Subjects:Physical Science > Nanophysics
ID Code:2617
Deposited By:Anuj Seth
Deposited On:09 Jan 2009 15:35
Last Modified:09 Jan 2009 15:35

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