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Visualization of localized intense optical fields in single gold-nanoparticle assemblies and ultrasensitive Raman
Kohei Imura1, Hiromi Okamoto, Mohammad K Hossain
1Institute for Molecular Science and The Graduate University for Advanced Studies, Okazaki, Aichi 444-8585, Japan.
Abstract:
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.
