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Optical spectroscopy of single trapped metal nanoparticles in solution

Journal article
Authors Juris Prikulis
Fredrik Svedberg
Mikael Käll
Jonas Enger
Kerstin Ramser
Mattias Goksör
Dag Hanstorp
Published in Nano Letters
Volume 4
Issue 1
Pages 115-118
ISSN 1530-6984
Publication year 2004
Published at Department of Physics (GU)
Pages 115-118
Language en
Links dx.doi.org/10.1021/nl0349606
Subject categories Engineering physics, Optics

Abstract

We present a simple method for the optical manipulation and spectroscopy of colloidal silver nanoparticles in aqueous solution using optical tweezers combined with dark-field microscopy. Because of their localized plasmon resonances, single trapped metal nanoparticles can be used as efficient near-field optical probes, with potential applicability in surface-enhanced spectroscopy, near-field microscopy, and biochemical sensing schemes. As a proof of principle, we study the near-field optical interaction between a trapped and an immobilized Ag nanoparticle.

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