Probing confined fields with single molecules and vice versa.

Sick B; Hecht B; Wild UP; Novotny L

doi:10.1046/j.1365-2818.2001.00795.x

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Journal article

Probing confined fields with single molecules and vice versa.

Sick B Physical Chemistry Laboratory, Swiss Federal Institute of Technology, ETH-Zentrum, CH-8092 Zürich, Switzerland.
Hecht B
Wild UP
Novotny L

2001-04-20

Published in:

Journal of microscopy. - 2001

Pathology and Forensic Medicine

Histology

English Single dye molecules are used as local probes to map the spatial distribution of the squared electric field components in the focus of a high numerical aperture lens. Simulated field distributions are quantitatively verified by experimentally obtained fluorescence excitation maps. We show that annular illumination can be used to engineer the field distribution in the focus at a dielectric/air interface such that electric field components in all directions acquire comparable magnitudes. The 3D orientation of molecular absorption dipoles can be determined by comparing measured to simulated image patterns. The presence of longitudinal electric field components in a focus is of particular interest in tip-enhanced scanning near-field optical microscopy.

Language

English

Open access status

green

Identifiers

DOI 10.1046/j.1365-2818.2001.00795.x
PMID 11309097

Persistent URL

https://sonar.ch/global/documents/283904

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