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Related Concept Videos

Overview of Microscopy Techniques01:22

Overview of Microscopy Techniques

The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...

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Simultaneous Label-Free Autofluorescence Multi-Harmonic Microscopy
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Pump-probe optical microscopy for imaging nonfluorescent chromophores.

Lu Wei1, Wei Min

  • 1Department of Chemistry, Columbia University, New York, NY 10027, USA.

Analytical and Bioanalytical Chemistry
|March 14, 2012
PubMed
Summary

Pump-probe microscopy offers fluorescence-free imaging for nonfluorescent molecules. This technique uses light pulses to detect molecules, enabling sensitive imaging in live biological samples.

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Area of Science:

  • Optics and Photonics
  • Molecular Imaging
  • Biophysics

Background:

  • Many molecules absorb light but do not fluoresce, limiting imaging options.
  • Conventional fluorescence microscopy cannot visualize these nonfluorescent molecules.
  • Advanced microscopy is needed for sensitive imaging of nonfluorescent chromophores in biological systems.

Purpose of the Study:

  • To review and summarize the principles of pump-probe microscopy.
  • To highlight its potential for imaging nonfluorescent molecules.
  • To discuss its application in live biological imaging.

Main Methods:

  • Utilizing pump-probe optical microscopy techniques.
  • Employing fundamental light-molecule interactions (excited state absorption, stimulated emission, ground state depletion, photothermal effect).
  • Using a laser scanning microscope with pump and probe pulses to interrogate transient molecular states.

Main Results:

  • Pump-probe microscopy provides fluorescence-free contrast.
  • Achieves high sensitivity and specificity for nonfluorescent chromophores.
  • Demonstrated single-molecule sensitivity in imaging.

Conclusions:

  • Pump-probe microscopy is a powerful emerging technique for molecular imaging.
  • It overcomes limitations of fluorescence microscopy for nonfluorescent molecules.
  • Offers significant potential for live cell, tissue, and organism imaging.