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Variable incidence angle fluorescence interference contrast microscopy for z-imaging single objects.

Caroline M Ajo-Franklin1, Prasad V Ganesan, Steven G Boxer

  • 1Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA.

Biophysical Journal
|August 9, 2005
PubMed
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We developed variable incidence angle fluorescence interference contrast microscopy (VIA-FLIC) for precise z-axis measurements. This versatile fluorescence microscopy technique offers nanometer resolution for biological systems with simple modifications to standard microscopes.

Area of Science:

  • Optical microscopy
  • Surface science
  • Nanotechnology

Background:

  • Surface-generated structured illumination microscopy provides nanometer z-axis resolution.
  • Existing methods are often experimentally complex or limited in application.

Purpose of the Study:

  • To introduce a novel, versatile surface-generated structured illumination microscopy technique.
  • To enable high-resolution z-axis measurements for diverse biological systems.

Main Methods:

  • Variable incidence angle fluorescence interference contrast microscopy (VIA-FLIC) was developed.
  • Excitation light incidence angle was varied using annular photomasks.
  • Fluorescence intensity changes were correlated with sample-surface separation.

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Main Results:

  • VIA-FLIC accurately determined SiO2 layer thicknesses in model systems.
  • Quantitative analysis yielded precise z-axis measurements.
  • The method demonstrated dependence on sample-surface separation.

Conclusions:

  • VIA-FLIC offers a versatile and high-resolution method for z-reconstruction.
  • Simple modifications to standard epifluorescence microscopes enable its use.
  • This technique is applicable to a wide range of biological systems.