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Imaging Biological Samples with Optical Microscopy01:18

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Updated: Jun 22, 2026

Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
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Mapping microscope object polarized emission to the back focal plane pattern.

Thomas P Burghardt1, Katalin Ajtai

  • 1Mayo Clinic Rochester, Department of Biochemistry, 200 First Street South West, Rochester, Minnesota 55905, USA. burghardt@mayo.edu

Journal of Biomedical Optics
|July 2, 2009
PubMed
Summary

This study introduces back focal plane (BFP) imaging to precisely determine fluorescent dipole orientation and distance. This technique overcomes limitations in conventional microscopy, enabling single-molecule imaging in complex biological samples like muscle fibers.

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Area of Science:

  • Optical microscopy
  • Biophysics
  • Single-molecule imaging

Background:

  • Conventional fluorescence polarization microscopy struggles with dipole orientation degeneracy.
  • Distinguishing single-molecule signals from background noise in dense biological samples is challenging.

Purpose of the Study:

  • To develop a method for unambiguously determining fluorescent dipole orientation and distance from an interface.
  • To enable single-molecule imaging in fluorophore-dense environments, such as muscle fibers.

Main Methods:

  • Utilized back focal plane (BFP) intensity patterns generated by total internal reflection (TIR) excitation.
  • Analyzed BFP patterns to interpret dipole orientation and proximity to interfaces (glass or metal-coated glass).
  • Implemented BFP pattern inspection and BFP masking to resolve dipole orientation degeneracy.
  • Adapted imaging to a non-telecentric plane to separate single-molecule signals from background noise.

Main Results:

  • Established a correlation between BFP patterns and fluorescent dipole orientation and distance.
  • Demonstrated that BFP pattern analysis removes the ambiguity in dipole orientation measurements.
  • Successfully imaged single photoactivated photoactivatable green fluorescent protein (PAGFP)-tagged myosin in a muscle fiber.
  • Achieved single-molecule detection despite high background fluorescence.

Conclusions:

  • Back focal plane (BFP) pattern imaging offers a robust method to determine dipole orientation and distance.
  • This technique effectively eliminates degeneracy issues present in standard fluorescence polarization measurements.
  • The adapted TIR/BFP imaging is suitable for single-molecule studies in complex, high-background biological systems.