SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 7: Poster I

Q 7.8: Poster

Monday, March 6, 2023, 16:30–19:00, Empore Lichthof

Guided acceleration in dielectric laser accelerators — •Leon Brückner, Tomás Chlouba, Johannes Illmer, Stefanie Kraus, Julian Litzel, Roy Shiloh, and Peter Hommelhoff — Department Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen

Dielectric laser accelerators (DLA) are a highly promising technology that could enable the miniaturiziation of accelerators to tabletop or even microchip size. A DLA consists of a silicon nanostructure that is illuminated with a pulsed laser. This creates an evanescent near-field that accelerates electrons entering the channel of the structure. To reach high energies, it is necessary to extend this interaction from micrometer length to millimeters or more. This is challenging as the electrons also experience deflecting forces and are eventually lost. To counteract this, we have employed an alternating phase focusing scheme: the electrons experience alternating transversal focusing and defocusing forces, guiding them through the structure. We could guide a 28.4 keV electron beam through the 225 nm wide channel of a 77 μm long nanostructure [1]. To accelerate with this scheme, it is also necessary to continuously change the grating periodicity (tapering) to conserve phase-matching between the particles and the accelerating field. We have developed and fabricated structures with lengths of several hundred micrometers that combine particle guiding with tapering. These structures will enable acceleration over much longer distances than previously possible. We will report the current state of the experiment. [1] R. Shiloh et al., Nature 597, 498-502 (2021)