Optical Frequency Mixing at Coupled Gold Nanoparticles

Matthias Danckwerts and Lukas Novotny
Phys. Rev. Lett. 98, 026104 – Published 10 January 2007

Abstract

We present nonlinear-optical four-wave mixing (4WM) at coupled gold nanoparticles. By decreasing the interparticle distance from large separation to touching contact, the 4WM yield increases by 4 orders of magnitude. The reason for this dramatic enhancement lies in the shift of the localized plasmon resonance to infrared wavelengths as the dimer is formed, making one of the input wavelengths doubly resonant. At the touching point, the 4WM signal changes discontinuously because of a sudden charge redistribution imposed by the formation of a conductive bridge. The 4-wave mixing signal provides an ultrasensitive measure for the contact point between a pair of particles and it can be employed as a spatially and temporally controllable photon source.

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  • Received 20 September 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.026104

©2007 American Physical Society

Authors & Affiliations

Matthias Danckwerts and Lukas Novotny*

  • Institute of Optics, University of Rochester, Rochester, New York USA

  • *Electronic address: http://www.nano-optics.org

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Issue

Vol. 98, Iss. 2 — 12 January 2007

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