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Azimuthal Beam Scanning Microscope Design and Implementation for Axial Localization with Scanning Angle Interference

Marshall Colville1, Sangwoo Park1, Avtar Singh2,3

  • 1Graduate Field of Biophysics, Cornell University, Ithaca, NY, USA.

Methods in Molecular Biology (Clifton, N.J.)
|November 27, 2021
PubMed
Summary
This summary is machine-generated.

Azimuthal beam scanning, or circle scanning, eliminates microscopic artifacts in laser illumination microscopy. This technique improves precision in scanning angle interference microscopy (SAIM) by averaging illumination over time.

Keywords:
Azimuthal beam scanning TIRFMCircle-scanned TIRFMFluorescence microscopyInterference microscopyLive-cell imagingLocalization microscopyScanning-angle interference microscopy

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Area of Science:

  • Microscopy
  • Optical Physics
  • Nanotechnology

Background:

  • Coherence artifacts in laser-based microscopy, particularly TIRF microscopy, arise from optical imperfections causing uneven excitation fields.
  • These artifacts are problematic for high-precision techniques like SAIM, which require homogeneous illumination.

Purpose of the Study:

  • To apply azimuthal beam scanning to scanning angle interference microscopy (SAIM) for improved axial localization.
  • To develop an optimized instrument configuration and open-source hardware for high-precision SAIM.

Main Methods:

  • Implementing azimuthal beam scanning (circle scanning) to average out illumination imperfections.
  • Designing and constructing an optimized SAIM instrument with open-source hardware.
  • System calibration for accurate axial localization.

Main Results:

  • Successfully eliminated coherence artifacts in SAIM using azimuthal beam scanning.
  • Achieved nanometer-scale axial localization precision.
  • Significantly increased temporal resolution compared to previous SAIM implementations.

Conclusions:

  • Azimuthal beam scanning is a critical technique for enhancing SAIM performance.
  • The developed open-source instrument enables high-precision and high-temporal-resolution axial localization.
  • This approach offers a robust solution for advanced microscopy applications requiring homogeneous illumination.