Related Experiment Video
Updated: Jan 10, 2026
09:49
An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
16.4K
Realization of a Pre-Sample Photonic-Based Free-Electron Modulator in Ultrafast Transmission Electron Microscopes.
Beatrice Matilde Ferrari1,2, Cameron James Richard Duncan1, Michael Yannai3
1LUMiNaD, Department of Materials Science, University of Milano-Bicocca, Milano 20126, Italy.
ACS Photonics
|November 26, 2025
Summary
Researchers developed a photonic modulator to shape electron beams in ultrafast transmission electron microscopes (TEMs). This breakthrough allows for precise control of electron wave functions before sample interaction, enhancing imaging capabilities.
Area of Science:
- Physics
- Materials Science
- Optics
Background:
- Spatial and temporal light modulation is crucial for advanced optical imaging.
- Transmission electron microscopy (TEM) offers nanometer-scale resolution.
- Adapting light modulation techniques to electron beams in TEMs is a significant technological goal.
Purpose of the Study:
- To experimentally realize a photonic-based free-electron modulator for presample electron-beam shaping in ultrafast TEMs.
- To coherently modulate both transverse and longitudinal components of the electron wave function.
- To enable photonics-inspired imaging and spectroscopy in electron microscopy.
Main Methods:
- Integration of a photonic-based free-electron modulator into the column of two ultrafast TEMs.
- Utilizing electron-photon interaction for coherent modulation of electron wave functions.
- Employing dynamically controlled optical fields and tailored electron-laser-sample interaction geometries.
- Using energy- and momentum-resolved electron detection for wave function reconstruction.
Main Results:
- Successful experimental realization of presample electron-beam shaping using a photonic modulator.
- Coherent modulation of both lateral phase (transverse) and temporal profile (longitudinal) of the electron wave function.
- Reconstruction of the shaped electron wave function at the TEM sample plane.
- Demonstration of controlled manipulation of electron wave functions prior to sample interaction.
Conclusions:
- The developed photonic modulator effectively shapes electron beams within ultrafast TEMs.
- This technique allows for precise control over the electron wave function before it interacts with the sample.
- The results open new avenues for advanced photonics-inspired imaging and spectroscopy in electron microscopy.
More Related Videos
Related Concept Videos
01:15Transmission Electron Microscopy
6.8K
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...
6.8K
01:25Overview of Electron Microscopy
12.9K
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.
12.9K
01:20Preparation of Samples for Electron Microscopy
6.7K
To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...
6.7K