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Frequency-encoded two-photon excited fluorescence microscopy.

Sandro Heuke, Carla Silva Martins, Rémi André

|August 1, 2023

Summary

This summary is machine-generated.

This study introduces frequency-encoded two-photon excited fluorescence (FE-2PEF) microscopy, a novel method for biomedical imaging. FE-2PEF enhances imaging efficiency and fluorophore discrimination by analyzing excitation spectra instead of emission spectra.

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Published on: January 19, 2011

Area of Science:

Biomedical Imaging
Microscopy Techniques
Optical Physics

Background:

Two-photon excited fluorescence (2PEF) microscopy is a leading non-linear imaging method for biological samples.
Current 2PEF methods rely on emission discrimination, which can lead to photon loss and cross-talk issues when fluorophore emission spectra overlap.
Limitations in current 2PEF include reduced imaging efficiency and speed due to inherent photon loss outside filter ranges.

Purpose of the Study:

To develop an alternative 2PEF method that overcomes the limitations of emission discrimination.
To introduce a novel approach for discriminating fluorophores based on their excitation spectra.
To improve imaging efficiency and reduce cross-talk in 2PEF microscopy.

Main Methods:

Developed a frequency-encoded 2PEF (FE-2PEF) technique utilizing two lasers with distinct wavelengths (ω1, ω2).
Excitation energies generated include 2ω1, 2ω2, and the mixing energy ω1+ω2.
Employed a single detector for all 2PEF emission, with lasers frequency-encoded via intensity modulation. Signal demodulation used a lock-in amplifier, followed by customized nonnegative matrix factorization (NNMF) for image generation.

Main Results:

Demonstrated a novel excitation discrimination method for 2PEF microscopy.
Achieved fluorescence images free of cross-talk using NNMF.
The FE-2PEF method collects all emitted photons on a single detector, enhancing efficiency.

Conclusions:

FE-2PEF microscopy offers an alternative to traditional emission discrimination, improving imaging efficiency and speed.
This method effectively distinguishes fluorophores with similar emission profiles.
Combining FE-2PEF with multiple detectors promises simultaneous imaging of a significantly higher number of fluorophores.