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Updated: Jun 15, 2026
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Nanotopology of Cell Adhesion upon Variable-Angle Total Internal Reflection Fluorescence Microscopy (VA-TIRFM)
Published on: October 2, 2012
Autocalibrated scanning-angle prism-type total internal reflection fluorescence microscopy for nanometer-precision
Wei Sun1, Kyle Marchuk, Gufeng Wang
1Ames Laboratory-USDOE and Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA.
Analytical Chemistry
|February 27, 2010
Summary
A new total internal reflection fluorescence microscope (TIRFM) achieves sub-10 nm vertical resolution. This automated system precisely calibrates illumination and scans angles for advanced nanoscale imaging and material analysis.
Area of Science:
- Microscopy
- Nanotechnology
- Optics
Background:
- Total Internal Reflection Fluorescence Microscopy (TIRFM) is crucial for high-resolution imaging near surfaces.
- Achieving optimal vertical resolution in TIRFM requires precise control over illumination angles and calibration.
- Existing TIRFM setups often lack automated capabilities for angle scanning and precise calibration.
Purpose of the Study:
- To develop and validate an automated prism-type TIRFM system for superior vertical resolution.
- To enable precise control and scanning of incident laser angles for enhanced evanescent field generation.
- To demonstrate the system's capability in determining nanoscale vertical positions and material properties.
Main Methods:
- Construction of an automated prism-type TIRFM with scanning-angle capabilities.
- Automatic calibration of laser illumination to the microscope's field of view center.
- Acquisition and fitting of fluorescence intensity decay curves from nanospheres using theoretical models.
- Monte Carlo simulations and statistical analysis for resolution assessment.
Main Results:
- Demonstrated axial resolution better than 10 nm under rigorous statistical analysis.
- Successfully determined vertical positions of fluorescent nanospheres in agarose gel.
- Enabled precise measurement of microtubule tilting angles and surface plasmon resonance (SPR) angles for gold films.
Conclusions:
- The developed automated TIRFM system offers unprecedented vertical resolution.
- The system provides an automated and reproducible method for optimizing illumination configurations in complex systems.
- This advanced TIRFM is valuable for nanoscale metrology, material science, and biological imaging.
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