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Related Concept Videos

Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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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...
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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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Confocal Fluorescence Microscopy01:16

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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,...
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Updated: Mar 9, 2026

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Cathodoluminescence in the scanning transmission electron microscope.

M Kociak1, L F Zagonel2

  • 1Laboratoire de Physique des Solides, Université Paris-SudParis-Sud, CNRS-UMR 8502, Orsay 91405, France.

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|January 2, 2017
PubMed
Summary

Scanning transmission electron microscopy-cathodoluminescence (STEM-CL) advances optical materials analysis. This technique now reveals new physics in plasmonics and quantum emitters, overcoming previous limitations.

Keywords:
Band gap measurementsCathodoluminescenceNano-opticsPlasmonicsQuantum emittersSTEM

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Cathodoluminescence (CL) is crucial for studying material optical properties.
  • Recent integration with scanning transmission electron microscopy (STEM) has unlocked advanced plasmonics and quantum emitter research.

Purpose of the Study:

  • To review recent advancements in STEM-CL that overcome prior technical and conceptual limitations.
  • To highlight new research avenues enabled by modern STEM-CL techniques.

Main Methods:

  • Introduction to various STEM-CL operating modes and instrumentation specifics.
  • Investigation of coherent (plasmons) and incoherent (quantum emitters) optical excitations using STEM-CL.
  • Analysis of light production physics and experimental interpretation in STEM-CL.

Main Results:

  • Demonstration of STEM-CL's capability to probe plasmonics and quantum emitters with unprecedented detail.
  • Detailed comparison of STEM-CL with complementary techniques like SEM-CL, photoluminescence, and EELS.
  • Comprehensive overview of recent applications showcasing the technique's versatility.

Conclusions:

  • Modern STEM-CL has overcome previous limitations, offering powerful new capabilities for materials research.
  • The technique provides unique insights into optical properties, particularly for plasmonics and quantum emitters.
  • STEM-CL is a rapidly evolving field with significant potential for future discoveries.