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Proceedings Paper

Near-field scanning optical microscopy for imaging domains in biomembranes
Author(s): Paul DeRose; Jeeseong Hwang; Laurie S. Goldner
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Paper Abstract

Near-field scanning optical microscopy (NSOM) combines the frequency-specific detection associated with optical spectroscopy with the improved spatial resolution of a near- field probe. In NSOM, a tapered, metal-coated fiber optic with a sub-wavelength aperture at the end is used to illuminate a surface placed in the near-field of the aperture. This technique is capable of resolution down to 20 nm, and is particularly suited for imaging >20 nm to micrometers sized domains that do not possess significant topography and are not well imaged by other scanning probe techniques, such as atomic force microscopy. Biological and biomimetic membranes have been shown to posses domains that can be well characterized by NSOM. In this study, the lateral distribution and shape of these domains in lipid monolayers were characterized at particular surface pressures and in the presence of other compounds, such as cholesterol, using NSOM. The species to be detected was labeled with an appropriate fluorophore and fluorescence emission was measured as the NSOM tip optically excited a local volume at each point of a raster scan across the sample surface.

Paper Details

Date Published: 30 April 1998
PDF: 7 pages
Proc. SPIE 3272, Laser Techniques for Surface Science III, (30 April 1998); doi: 10.1117/12.307141
Show Author Affiliations
Paul DeRose, National Institute of Standards and Technology (United States)
Jeeseong Hwang, National Institute of Standards and Technology (United States)
Laurie S. Goldner, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 3272:
Laser Techniques for Surface Science III
Hai-Lung Dai; Hans-Joachim Freund, Editor(s)

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