Electron energy analysis by phase-space shaping with THz field cycles | Zendy

Dominik Ehberger | Zendy; Catherine Kealhofer | Zendy; Peter Baum | Zendy

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Electron energy analysis by phase-space shaping with THz field cycles

Author(s) -

Dominik Ehberger,

Catherine Kealhofer,

Peter Baum

Publication year - 2018

Publication title -

structural dynamics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.415

H-Index - 29

ISSN - 2329-7778

DOI - 10.1063/1.5045167

Subject(s) - femtosecond , terahertz radiation , laser , electron , electron energy loss spectroscopy , resolution (logic) , spectroscopy , optics , physics , energy (signal processing) , atomic physics , materials science , computational physics , computer science , quantum mechanics , artificial intelligence

Time-resolved electron energy analysis and loss spectroscopy can reveal a wealth of information about material properties and dynamical light-matter interactions. Here, we report an all-optical concept for measuring energy spectra of femtosecond electron pulses with sub-eV resolution. Laser-generated terahertz radiation is used to measure arrival time differences within electron pulses with few-femtosecond precision. Controlled dispersion and subsequent compression of the electron pulses provide almost any desired compromise of energy resolution, signal strength, and time resolution. A proof-of-concept experiment on aluminum reveals an energy resolution of <3.5 eV (rms) at 70-keV after a drift distance of only 0.5 m. Simulations of a two-stage scheme reveal that pre-stretched pulses can be used to achieve <10 meV resolution, independent of the source's initial energy spread and limited only by the achievable THz field strength and measuring time.

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