4 November 2002 Fluorescence enhancement in noncontact and dynamic-force apertureless near-field scanning optical microscopy
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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.
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Vladimir V. Protasenko, Vladimir V. Protasenko, Alan C. Gallagher, Alan C. Gallagher, David J. Nesbitt, David J. Nesbitt, } "Fluorescence enhancement in noncontact and dynamic-force apertureless near-field scanning optical microscopy", Proc. SPIE 4809, Nanoscale Optics and Applications, (4 November 2002); doi: 10.1117/12.456755; https://doi.org/10.1117/12.456755
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