Visualization of Localized Intense Optical Fields in Single Gold−Nanoparticle Assemblies and Ultrasensitive Raman Active Sites
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.
†
Institute for Molecular Science.
‡
The Graduate University for Advanced Studies.
*
Corresponding author. Tel: +81-564-55-7320. Fax: +81-564-55-4639. E-mail: [email protected]
§
University of Tsukuba and National Institute for Materials Science.
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