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Second-harmonic generation from coupled plasmon modes in a single dimer of gold nanospheres

A. Slablab, L. Le Xuan, M. Zielinski, Y. de Wilde, V. Jacques, D. Chauvat, J.-F. Roch, Opt. Exp. 20, 220 (2012)

We show that a dimer made of two gold nanospheres exhibits a remarkable efficiency for second-harmonic generation under femtosecond optical excitation. The detectable nonlinear emission for the given particle size and excitation wavelength arises when the two nanoparticles are as close as possible to contact, as in situ controlled and measured using the tip of an atomic force microscope. The excitation wavelength dependence of the second-harmonic signal supports a coupled plasmon resonance origin with radiation from the dimer gap. This nanometer-size light source might be used for high-resolution near-field optical microscopy.

Optics Express, Vol. 20, Issue 1, pp. 220-227 (2012)
 
doi: 10.1364/OE.20.000220
Open access : arXiv:1108.5256

Acknowledgements
We dedicate this work to our esteemed colleague Dominique Chauvat who passed away during the preparation of the manuscript. We are grateful to S. Perruchas and T. Gacoin for providing us with the GNs sample. We thank J.-J. Greffet and F. Marquier for priceless discussions. This work is supported by C'Nano Ile-de-France.
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