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Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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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Related Experiment Video

Updated: May 10, 2026

Near Simultaneous Laser Scanning Confocal and Atomic Force Microscopy (Conpokal) on Live Cells
09:20

Near Simultaneous Laser Scanning Confocal and Atomic Force Microscopy (Conpokal) on Live Cells

Published on: August 11, 2020

Spatial resolution of confocal XRF technique using capillary optics.

Maël Dehlinger1, Carole Fauquet, Sebastien Lavandier

  • 1CNRS, UMR7325, Aix-Marseille Univ,, CINaM, Marseille 13288, France. didier.tonneau@univ-amu.fr.

Nanoscale Research Letters
|June 14, 2013
PubMed
Summary

Researchers developed a confocal X-ray fluorescence (XRF) test-bed to improve elemental analysis resolution. This new system focuses X-ray beams to achieve higher chemical mapping precision, paving the way for advanced microscopy techniques.

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Last Updated: May 10, 2026

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Physics

Background:

  • X-ray fluorescence (XRF) is a sensitive elemental analysis method.
  • Current XRF resolution is limited by the excitation X-ray beam size.
  • Improving lateral resolution is crucial for advanced chemical mapping.

Purpose of the Study:

  • To develop and test a confocal X-ray fluorescence (XRF) system.
  • To estimate the ultimate lateral resolution achievable in chemical mapping.
  • To explore the potential of combining XRF with scanning probe microscopy.

Main Methods:

  • A polycapillary lens was used to focus the X-ray beam from a rhodium source.
  • A silicon drift detector (SDD) collected fluorescence signals via a monocapillary.
  • The system was tested with capillary radii from 50 μm down to 5 μm.

Main Results:

  • The confocal XRF test-bed successfully focused the X-ray beam.
  • The geometry of the fluorescent zone was characterized.
  • The study provides an estimation of the ultimate lateral resolution.

Conclusions:

  • The developed confocal XRF system offers potential for enhanced resolution.
  • This technique is applicable for both in-lab and synchrotron beamline analyses.
  • A novel tool integrating local XRF and scanning probe microscopy is proposed.