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Related Concept Videos

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.

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A Step Beyond BRET: Fluorescence by Unbound Excitation from Luminescence (FUEL)
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Published on: May 23, 2014

What can stimulated emission do for bioimaging?

Lu Wei1, Wei Min

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

Annals of the New York Academy of Sciences
|May 23, 2013
PubMed
Summary

Stimulated emission techniques enhance light microscopy, enabling deeper and clearer imaging of biological structures. These methods overcome resolution limits and image nonfluorescent molecules for advanced bioimaging applications.

Keywords:
deep tissue imagingimaging-depth limitnonfluorescent chromophorepump-probe microscopystimulated emissionsuperresolution

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Area of Science:

  • Optics and Photonics
  • Biophysics
  • Microscopy

Background:

  • Bioimaging advances rely on microscopic scale studies.
  • Stimulated emission is key to improving light microscopy.
  • This process competes with spontaneous emission.

Purpose of the Study:

  • Summarize and compare three stimulated emission techniques for light microscopy.
  • Address challenges in bioimaging resolution, contrast, and depth.
  • Highlight the role of stimulated emission in overcoming limitations.

Main Methods:

  • Stimulated emission depletion (STED) microscopy: detects residual fluorescence after quenching.
  • Stimulated emission microscopy: images nonfluorescent chromophores via stimulated emission beam intensity gain.
  • Stimulated emission reduced fluorescence microscopy: measures reduced fluorescence for extended imaging depth.

Main Results:

  • STED microscopy breaks the diffraction-limited resolution barrier.
  • Stimulated emission microscopy enables imaging of nonfluorescent but absorbing molecules.
  • Stimulated emission reduced fluorescence microscopy extends the imaging depth limit of two-photon microscopy.

Conclusions:

  • Stimulated emission, through ingenious spectroscopy, opens new bioimaging territories.
  • These techniques allow examination of smaller, darker, and deeper biological structures.
  • The reviewed methods offer novel solutions for advanced bioimaging challenges.