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Journal Article

Acceleration of sub-relativistic electrons with an evanescent optical wave at a planar interface

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Hommelhoff,  P.
Hommelhoff Group, Associated Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Kozak, M., Beck, P., Deng, H., McNeur, J., Schoenenberger, N., Gaida, C., et al. (2017). Acceleration of sub-relativistic electrons with an evanescent optical wave at a planar interface. OPTICS EXPRESS, 25(16), 19195-19204. doi:10.1364/OE.25.019195.


Cite as: https://hdl.handle.net/21.11116/0000-0000-8329-E
Abstract
We report on a theoretical and experimental study of the energy transfer between an optical evanescent wave, propagating in vacuum along the planar boundary of a dielectric material, and a beam of sub-relativistic electrons. The evanescent wave is excited via total internal reflection in the dielectric by an infrared (lambda = 2 mu m) femtosecond laser pulse. By matching the electron propagation velocity to the phase velocity of the evanescent wave, energy modulation of the electron beam is achieved. A maximum energy gain of 800 eV is observed, corresponding to the absorption of more than 1000 photons by one electron. The maximum observed acceleration gradient is 19 +/- 2 MeV/m. The striking advantage of this scheme is that a structuring of the acceleration element's surface is not required, enabling the use of materials with high laser damage thresholds that are difficult to nano-structure, such as SiC, Al2O3 or CaF2. (C) 2017 Optical Society of America