Journal
ACS PHOTONICS
Volume 9, Issue 10, Pages 3215-3224Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.2c00850
Keywords
electron-beam shaping electron-photon interaction; PINEM; ultrafast transmission electron microscopy; spatial light modulator
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Funding
- European Union [964591]
- European Research Council [771346 ISCQuM, 789104-eNANO]
- Spanish MCINN [PID2020-112625GB-I00, CEX2019-000910-S]
- Generalitat de Catalunya (CERCA and AGAUR)
- Fundacios Cellex and Mir-Puig
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Researchers have successfully demonstrated the arbitrary transverse modulation of electron beams using shaped light beams, which eliminates the need for complex electron-optics elements or material nanostructures. This approach greatly expands the range of patterns that can be imprinted on electron profiles and facilitates tailored electron-beam shaping.
Spatiotemporal electron-beam shaping is a bold frontier of electron microscopy. Over the past decade, shaping methods evolved from static phase plates to low-speed electrostatic and magnetostatic displays. Recently, a swift change of paradigm utilizing light to control free electrons has emerged. Here, we experimentally demonstrate arbitrary transverse modulation of electron beams without complicated electron-optics elements or material nanostructures, but rather using shaped light beams. On-demand spatial modulation of electron wavepackets is obtained via inelastic interaction with transversely shaped ultrafast light fields controlled by an external spatial light modulator. We illustrate this method for the cases of Hermite-Gaussian and Laguerre-Gaussian modulation and discuss their use in enhancing microscope sensitivity. Our approach dramatically widens the range of patterns that can be imprinted on the electron profile and greatly facilitates tailored electron-beam shaping.
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