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Automated Two-dimensional Spatiotemporal Analysis of Mobile Single-molecule FRET Probes

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Scanless two-photon excitation with temporal focusing.

Eirini Papagiakoumou¹, Emiliano Ronzitti¹, Valentina Emiliani²

¹Wavefront-Engineering Microscopy Group, Photonics Department, Institut de la Vision, Sorbonne University, Inserm S968, CNRS UMR7210, Fondation Voir et Entendre, Paris, France.

|April 15, 2020

Summary

Temporal focusing enables scanless, widefield illumination for advanced microscopy. This technique improves imaging speed and axial confinement in scattering tissues, overcoming limitations of conventional two-photon microscopy.

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Area of Science:

Optics and Photonics
Biomedical Imaging
Neuroscience

Background:

Conventional two-photon microscopy uses point scanning, limiting excitation temporal resolution.
Investigating intact tissue in live animals requires efficient and minimally invasive imaging techniques.

Purpose of the Study:

To introduce temporal focusing as a superior alternative to point scanning in two-photon microscopy.
To highlight the benefits of scanless illumination with enhanced axial confinement.

Main Methods:

Utilizing a diffusive or dispersive optical element in a plane conjugate to the objective focal plane.
Generating position-dependent temporal pulse broadening for axially confined multiphoton absorption.
Replacing point scanning with temporally focused widefield illumination.

Main Results:

Achieved scanless illumination over large surface areas with micrometer axial confinement.
Demonstrated robust light propagation through scattering tissue.
Enabled faster imaging and improved resolution compared to conventional methods.

Conclusions:

Temporal focusing represents a significant advancement for two-photon microscopy.
This technique enhances imaging capabilities for various applications, including neuroscience and materials science.
Scanless, temporally focused illumination overcomes key limitations of traditional microscopy.