Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-08488-4
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Funding
- European Research Council (ERC Advanced Grant ComplexPlas)
- Bundesministerium fur Bildung und Forschung
- Deutsche Forschungsgemeinschaft [SPP1839]
- MWK Baden-Wurttemberg (IQST, ZAQuant)
- Baden-Wurttemberg Stiftung
- European Research Council (ERC)
- European Union Horizon 2020 research and innovation programme [823717 - ESTEEM3]
- European Research Council (ERC Starting Grant NanoBeam)
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Relativistic electron beams create optical radiation when interacting with tailored nanostructures. This phenomenon has been so far used to design grating-based and holographic electron-driven photon sources. It has been proposed recently that such sources can be used for hybrid electron- and light-based spectroscopy techniques. However, this demands the design of a thin-film source suitable for electron-microscopy applications. Here, we present a mesoscopic structure composed of an array of nanoscale holes in a gold film which is designed using transformation optics and delivers ultrashort chirped electromagnetic wave packets upon 30-200 keV electron irradiation. The femtosecond photon bunches result from coherent scattering of surface plasmon polaritons with hyperbolic dispersion. They decay by radiation in a broad spectral band which is focused into a 1.5 micrometer beam waist. The focusing ability and broadband nature of this photon source will initiate applications in ultrafast spectral interferometry techniques.
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