Visualization of localized intense optical fields in single gold-nanoparticle assemblies and ultrasensitive Raman active sites.
basic_science · Level V
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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.
Medical subject headings
- Gold
- Image Enhancement
- Nanostructures
- Nanotechnology
- Spectrum Analysis, Raman