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

Kohei Imura; Hiromi Okamoto; Mohammad K Hossain; Masahiro Kitajima

doi:10.1021/nl061650p

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

Nano Lett. 2006 Oct;6(10):2173-6. doi: 10.1021/nl061650p.

Authors

Kohei Imura¹, Hiromi Okamoto, Mohammad K Hossain, Masahiro Kitajima

Affiliation

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

PMID: 17034078
DOI: 10.1021/nl061650p

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.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Electromagnetic Fields
Gold / chemistry*
Image Enhancement / methods*
Light
Nanostructures / chemistry*
Nanostructures / ultrastructure*
Nanotechnology / methods*
Particle Size
Sensitivity and Specificity
Spectrum Analysis, Raman / methods*

Substances

Gold