Work

Interferometric optical detection and tracking of very small gold nanoparticles at a water-glass interface

Year: 2006

Type: article

Abstract: We use an interferometric detection scheme to directly detect single gold nanoparticles with a diameter as small as 5 nm in an aqueous environment. We demonstrate both confocal and wide-field detection of nanoparticles and study signal strength as a function of particle size. Furthermore, we demonstrate a detection speed up to 2 micros. We also show that gold nanoparticles can be readily distinguished from background scatterers by exploiting the wavelength dependence of their plasmon resonances. Our studies pave the way for the application of this detection scheme for particle tracking in biological systems.

Source: Optics Express

DOI: 10.1364/opex.14.000405

Authors: Volker Jacobsen, Patrick Stoller, Christian Brunner, Viola Vogel, Vahid Sandoghdar

Institutions: ETH Zurich, Laboratory of Physical Chemistry

Language: English

Topic: Orbital Angular Momentum in Optics

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funder: Eidgenössische Technische Hochschule Zürich