Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Nano Lett. 2007 May;7(5):1251-5. Epub 2007 Mar 31.

Local field asymmetry drives second-harmonic generation in non-centrosymmetric nanodimers.

Author information

  • 1Institute of Physics, Optics Laboratory, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland. brian.canfield@tut.fi

Abstract

We demonstrate that second-harmonic generation (SHG) from arrays of non-centrosymmetric 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.

PMID:
17397232
[PubMed]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for American Chemical Society
    Loading ...
    Write to the Help Desk