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Transmission Electron Microscopy01:15

Transmission Electron Microscopy

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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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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

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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.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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Overview of Electron Microscopy01:25

Overview of Electron Microscopy

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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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Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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Related Experiment Video

Updated: Apr 1, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Quantum coherent optical phase modulation in an ultrafast transmission electron microscope.

Armin Feist1, Katharina E Echternkamp1, Jakob Schauss1

  • 14th Physical Institute, Solids and Nanostructures, University of Göttingen, Göttingen 37077, Germany.

Nature
|May 15, 2015
PubMed
Summary

Scientists demonstrate coherent quantum manipulation of free-electron beams using light. This breakthrough enables precise control over electron momentum states, paving the way for attosecond electron pulses and advanced imaging techniques.

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Area of Science:

  • Quantum physics
  • Electron microscopy
  • Attosecond science

Background:

  • Coherent manipulation of quantum systems with light is crucial for quantum technologies.
  • Optical phase transfer to quantum wavefunctions underpins quantum state preparation and metrology.
  • Attosecond science relies on light-phase-modulated electron states for advanced techniques.

Purpose of the Study:

  • To demonstrate quantum-coherent phase-modulation of energetic free-electron beams.
  • To explore the potential for ultrafast imaging and spectroscopy using tailored electron pulses.

Main Methods:

  • Utilizing the interaction of ultrashort electron pulses with optical near-fields in an electron microscope.
  • Inducing Rabi oscillations in electron momentum states as a function of the optical driving field.

Main Results:

  • Demonstrated coherent quantum state manipulation of free-electron populations.
  • Observed Rabi oscillations in electron momentum states, agreeing with a multilevel quantum ladder model.
  • Showcased a light-driven 'quantum walk' that reshapes electron density in momentum space.
  • Confirmed the evolution of optically generated superposition states into attosecond electron pulses.

Conclusions:

  • Quantum control offers precision structuring of electron densities.
  • Potential applications include ultrafast electron spectroscopy, microscopy, accelerator science, and free-electron lasers.