Excitation-resolved hyperspectral fluorescence lifetime imaging using a UV-extended supercontinuum source.

Area of Science:

• Biophotonics and advanced imaging techniques.

Background:

• Fluorescence Lifetime Imaging (FLIM) provides functional and molecular information beyond simple intensity measurements.
• Hyperspectral imaging captures detailed spectral information, enhancing specificity.
• Optical sectioning is crucial for 3D imaging and reducing out-of-focus light.

Purpose of the Study:

• To develop and present a novel microscope combining time-gated, optically sectioned, hyperspectral FLIM.
• To integrate a tunable supercontinuum excitation source covering the UV range.
• To demonstrate the system's capability in resolving excitation spectra, emission spectra, and fluorescence decays within optically sectioned images.

Main Methods:

• Implementation of a time-gated detection scheme for enhanced temporal resolution.
• Incorporation of a tunable supercontinuum laser source for versatile excitation.
• Utilizing optical sectioning techniques for depth-resolved imaging.
• Acquisition of hyperspectral data to analyze spectral signatures.
• Measurement of fluorescence decay kinetics.

Main Results:

• The developed microscope successfully integrates time-gating, optical sectioning, and hyperspectral capabilities.
• The tunable supercontinuum source effectively covers the UV excitation range.
• The system accurately resolves excitation spectra, emission spectra, and fluorescence decays in 3D.
• Demonstrated potential for advanced biological and material science imaging.

Conclusions:

• The presented hyperspectral FLIM microscope offers a powerful new tool for complex imaging applications.
• The system's ability to capture multiple dimensions of fluorescence information (spectral, temporal, spatial) provides unprecedented analytical depth.
• This technology opens new avenues for research requiring detailed characterization of fluorescent samples.