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Tapping Mode Near-Field Scanning Optical Microscopy of Molecular Crystals and Thin Films

Published online by Cambridge University Press:  02 July 2020

C. Daniel Frisbie ,
Andrey Kosterin  and
Helena Stadniychuk
C. Daniel Frisbie*
Affiliation:
Department of Chemical Engineering, and, Materials Science, University of Minnesota, Minneapolis, MN55455
Andrey Kosterin
Affiliation:
Department of Chemical Engineering, and, Materials Science, University of Minnesota, Minneapolis, MN55455
Helena Stadniychuk
Affiliation:
Department of Chemical Engineering, and, Materials Science, University of Minnesota, Minneapolis, MN55455
*
*
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Extract

The diffraction of visible light limits the spatial resolution in conventional optical microscopy to about 200-300 nm. In near-field scanning optical microscopy (NSOM), resolution is improved by bringing the light source, such as the end of an optical fiber, very close to the sample surface. Laser light coupled into the opposite end of the fiber propagates down the fiber core and is emitted from the aperture of the tip. When the sample is in the near-field(roughly within one tip diameter of the end of the tip), the spatial resolution is essentially equal to the diameter of the aperture at the end of the tip and is not determined by diffraction effects. Two-dimensional imaging is accomplished by raster-scanning the sample underneath the fiber tip and collecting transmitted or reflected light at a photodetector.

Type
Developments In Scanned Probe Microscopy of Polymers
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 994 - 995
Copyright
Copyright © Microscopy Society of America

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References

1.Betzig, E.; Trautman, J. K.; Jarris, T. D.; Weiner, J. S.; Kostelak, R. L.Science 1991, 251 1468.CrossRefGoogle Scholar
2.Stadniychuk, H.; Frisbie, C. D. Manuscript in preparation.Google Scholar
3.Kosterin, A. V.;Frisbie, C. D. Manuscript in preparation.Google Scholar