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Proceedings Paper

Optical microscopy and spectroscopy beyond the diffraction limit
Author(s): Lukas Novotny; Erik J. Sanchez; Sunney Xie
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Paper Abstract

A new approach to near-field optical microscopy is presented. The method relies on the highly enhanced fields at sharp metal tips under proper laser illumination. These fields are laterally confined to the tip size and can be used to locally excite the sample surface. Detection of nonlinear responses ensure sufficient background discrimination. The strong field gradients close to the tip give also rise to a trapping force towards the tip. Therefore, the proposed scheme is also promising for optical trapping and alignment of dielectric particles in aqueous environments at the nanometer scale. The paper presents the result of self-consistent 3D field calculations. Starting with a discussion of commonly used aperture probes, the field distributions for the novel scheme are presented.

Paper Details

Date Published: 24 April 1998
PDF: 9 pages
Proc. SPIE 3273, Laser Techniques for Condensed-Phase and Biological Systems, (24 April 1998); doi: 10.1117/12.306128
Show Author Affiliations
Lukas Novotny, Pacific Northwest National Lab. (United States)
Erik J. Sanchez, Pacific Northwest National Lab. (United States)
Sunney Xie, Pacific Northwest National Lab. (United States)

Published in SPIE Proceedings Vol. 3273:
Laser Techniques for Condensed-Phase and Biological Systems
Norbert F. Scherer; Janice M. Hicks, Editor(s)

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