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Ensemble Force Spectroscopy by Shear Forces

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Published on: July 26, 2022

Spectrometer-Free Electron Spectromicroscopy.

F Javier García de Abajo^1,2, Cruz I Velasco¹

¹ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain.

|October 2, 2025

Summary

We developed a novel spectrally resolved electron microscopy technique that eliminates the need for electron spectrometers. This method uses electron beam interference to probe laser-irradiated specimens, simplifying microscope design.

Keywords:

electron microscopy electron−light interaction free-electron beams nanophotonics nanoscale optical excitations spectrometer-free spectroscopy

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Area of Science:

Physics
Materials Science
Microscopy

Background:

Spectrally resolved electron microscopy provides crucial insights into material properties.
Conventional methods often require complex and expensive electron spectrometers.

Purpose of the Study:

To introduce a simplified approach for spectrally resolved electron microscopy.
To enable characterization of optical responses in materials using electron-light interactions.

Main Methods:

Utilizing a coherent electron beam prepared as a superposition of multiple paths.
One path interacts with a laser-irradiated specimen, inducing electron-light scattering.
Employing complementary masks at conjugate image planes to modulate electron transmission based on optical response.

Main Results:

Electron-light scattering disturbs the interference pattern of the recombined electron paths.
The transmitted electron current correlates with the local optical response of the specimen.
The technique successfully enables spectrally resolved imaging without electron spectrometers.

Conclusions:

The proposed method offers a simplified and cost-effective alternative for spectrally resolved electron microscopy.
This technique facilitates the study of electron-light interactions and material optical properties.
The approach does not necessitate monochromatic electron beams, enhancing accessibility.