Electron Ghost Imaging

Siqi Li^1,*, Fredrick Cropp², Krish Kabra², Thomas J. Lane¹, Gordon Wetzstein³, Pietro Musumeci², Daniel Ratner^1,+

¹SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
²Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
³Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA
^*Corresponding author: siqili@slac.stanford.edu
⁺Corresponding author: dratner@slac.stanford.edu

Schematics of the ghost imaging experiment. An ultrashort 266 nm laser pulse illuminates the DMD and is then imaged onto the cathode. The generated electron beam is imaged using the gun solenoid onto a target located 2.7 m downstream. A single pixel bucket detector records the intensity of the transmitted beam after the target. The reduced intensity in the center of the electron profile is due to the cathode’s nonuniform quantum efficiency.

Abstract

In this Letter we report a demonstration of electron ghost imaging. A digital micromirror device directly modulates the photocathode drive laser to control the transverse distribution of a relativistic electron beam incident on a sample. Correlating the structured illumination pattern to the total sample transmission then retrieves the target image, avoiding the need for a pixelated detector. In our example, we use a compressed sensing framework to improve the reconstruction quality and reduce the number of shots compared to raster scanning a small beam across the target. Compressed electron ghost imaging can reduce both acquisition time and sample damage in experiments for which spatially resolved detectors are unavailable (e.g., spectroscopy) or in which the experimental architecture precludes full frame direct imaging.

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Citation

@article{li2018-egi,
title = {Electron Ghost Imaging},
author = {Li, S. and Cropp, F. and Kabra, K. and Lane, T. J. and Wetzstein, G. and Musumeci, P. and Ratner, D.},
journal = {Phys. Rev. Lett.},
volume = {121},
issue = {11},
pages = {114801},
numpages = {5},
year = {2018},
month = {Sep},
publisher = {American Physical Society},
doi = {10.1103/PhysRevLett.121.114801},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.121.114801}
}