Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.58: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

A Miniaturized Electron Source Based on Dielectric Laser Accelerator Operation at Higher Spatial Harmonics and a Nanotip Photoemitter — •Ang Li, Joshua McNeur, Martin Kozak, Dominik Ehberger, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstr. 1, 91058 Erlangen

Dielectric Laser Acceleration, a novel accelerator concept based on micron-scale dielectric grating structures driven by the high peak field of short laser pulses, can exceed the performance of RF-based accelerators. Recent experimental progress on dielectric laser acceleration of electrons with energies below 10 keV via interaction with high spatial harmonics of a DLA is discussed. Further, laser-triggered coherent electron emission from tungsten nanotips is discussed in the context of a novel DLA-based miniaturized electron gun[1]. The photoemitted low-emittance electron bunches suggests incorporation with sub-relativistic dielectric laser accelerators (DLAs). On tapered silicon grating structures, experimental results show an acceleration gradient (energy gain/interaction length) already analogous to the electron injectors in rf-based accelerators. The combination of the nanotip emitter with sub-relativistic DLAs to construct a mm-scale electron injector capable of producing arbitrary energies will be discussed.

[1] J. McNeur, D. Ehberger et al., J. Phys. B, accepted