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Nano Lett. 2006 Oct;6(10):2173-6.

Visualization of localized intense optical fields in single gold-nanoparticle assemblies and ultrasensitive Raman active sites.

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  • 1Institute for Molecular Science and The Graduate University for Advanced Studies, Okazaki, Aichi 444-8585, Japan.


We demonstrate visualization of localized intense electromagnetic fields in real space in well-tailored dimeric and trimeric gold nanospheres by using near-field optical techniques. With two-photon induced luminescence and Raman measurements, we show that the electric field is confined at an interstitial site in the aggregate. We also demonstrate optical switching operations for the electric-field localized sites in the trimer structure.

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