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Proceedings Paper

Fluorescence enhancement in noncontact and dynamic-force apertureless near-field scanning optical microscopy
Author(s): Vladimir V. Protasenko; Alan C. Gallagher; David J. Nesbitt
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Paper Abstract

The fluorescence of single ZnS overcoated CdSe quantum dots (QDs) and dye doped polystyrene spheres (PSs) embedded in the evanescent optical field has been studied using an apertureless near-field scanning optical microscope (ANSOM) operating in non-contact and dynamic-force modes. The fluorescence intensity of an individual QD can be enhanced 5 times when an HF etch-cleaned silicon probe is located over the QD and spatially resolved with ~30 nm full width at half maximum when the ANSOM is operating in non-contact mode. Furthermore, we show that the fluorescence contrast in ANSOM is typically 5 times greater than the above enhancement coefficient. In the case of ANSOM dynamic-force mode, the fluorescence of QDs and PSs depends on the pressure applied by the probe to the sample.

Paper Details

Date Published: 4 November 2002
PDF: 11 pages
Proc. SPIE 4809, Nanoscale Optics and Applications, (4 November 2002); doi: 10.1117/12.456755
Show Author Affiliations
Vladimir V. Protasenko, Univ. of Colorado/Boulder and National Institute of Standards and Technology (United States)
Alan C. Gallagher, Univ. of Colorado/Boulder and National Institute of Standards and Technology (United States)
David J. Nesbitt, Univ. of Colorado/Boulder and National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 4809:
Nanoscale Optics and Applications
Guozhong Cao; Wiley P. Kirk, Editor(s)

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