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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Published on: June 28, 2016

Multiphoton cascade absorption in single molecule fluorescence saturation spectroscopy.

Pascale Winckler¹, Rodolphe Jaffiol

¹Laboratoire de Nanotechnologie et d'Instrumentation Optique, Institut Charles Delaunay, UMR STMR CNRS 6279, Université de Technologie de Troyes, Troyes, France.

Analytical Chemistry

|March 26, 2013

Summary

This study explains how laser power affects single fluorescent molecules

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Area of Science:

Photophysics and Spectroscopy
Single-Molecule Studies
Fluorescence Microscopy

Background:

Saturation spectroscopy is crucial for studying single fluorescent molecules.
The effect of increasing laser excitation on molecular brightness is not fully understood.

Purpose of the Study:

To interpret the unexpected brightness evolution with laser power in single-molecule spectroscopy.
To investigate the role of multi-photon absorption (two and three photons) in fluorescence.
To understand the influence of confocal observation volume in fluorescence saturation spectroscopy.

Main Methods:

Comprehensive theoretical modeling of photophysical processes.
Experimental measurements using fluorescence saturation spectroscopy.
Analysis of single-molecule fluorescence emission (brightness).

Main Results:

Explained the non-linear relationship between laser power and molecular brightness.
Demonstrated the significance of cascade absorption of two and three photons.
Highlighted the critical role of the confocal observation volume.

Conclusions:

The study provides a theoretical and experimental framework for understanding brightness evolution in single-molecule spectroscopy.
Accurate interpretation of fluorescence saturation spectroscopy requires considering multi-photon absorption and observation volume effects.
This research advances the understanding of photophysical parameters in single fluorescent molecules.