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Related Experiment Video

Updated: Sep 6, 2025

Author Spotlight: Non-Invasive Imaging of Complex Bio-Structures Using Polarization-Sensitive Two-Photon Microscopy

Author Spotlight: Non-Invasive Imaging of Complex Bio-Structures Using Polarization-Sensitive Two-Photon Microscopy

Published on: September 8, 2023

Photon efficient orientation estimation using polarization modulation in single-molecule localization microscopy.

Rasmus Ø Thorsen^1,2, Christiaan N Hulleman^1,2, Bernd Rieger^1,2,3

¹Department of Imaging Physics, Delft University of Technology, Delft, The Netherlands.

Biomedical Optics Express

|July 1, 2022

Summary

This summary is machine-generated.

This study enhances biomolecule orientation precision in super-resolution microscopy by modulating excitation polarization. The new method achieves near-theoretical limits for orientation estimation, improving nanoscale analysis.

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Area of Science:

Biophysics
Optical Microscopy
Nanotechnology

Background:

Super-resolution microscopy enables nanoscale analysis of biomolecules.
Existing methods like MINFLUX and SIMFLUX improve localization precision.
Orientation estimation is crucial for understanding biomolecular function.

Purpose of the Study:

To enhance orientation precision in localization microscopy using modulated excitation polarization.
To theoretically and experimentally validate a novel polarization-based orientation estimation technique.
To assess the performance under low signal-to-background conditions.

Main Methods:

Theoretical analysis using Cramér-Rao bound (CRB) for two polarization modulation modes.
Simulations to evaluate performance with varying signal-to-background ratios and polarization inaccuracies.
Experimental validation using a custom-built polarization-controlled optical microscope.

Main Results:

A theoretical optimal polar angle of incidence for isotropic orientation precision was identified.
Simulations demonstrated achievable precision close to the CRB limit (2.4° azimuthal, 1.6° polar) with 1000 signal photons.
Experimental results showed in-plane precision close to the CRB limit for photon counts from 400 to 10,000.

Conclusions:

Modulating excitation polarization is a viable strategy to significantly improve orientation precision in localization microscopy.
The developed method offers superior performance compared to previous techniques, especially at low photon counts.
This technique advances nanoscale biomolecular orientation analysis.