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2018-07-02 - Colloque/Article dans les actes avec comité de lecture - Anglais - 4 page(s)

Rosolen Gilles , Wong Liang J, Rivera Nicholas, Maes Bjorn , Soljacic Marin, Kaminer Ido, "Metasurface-based free-electron multi-harmonic hard X-ray source" in International Conference on Transparent Optical Network (ITCON), Bucarest, Roumanie, 2018

  • Codes CREF : Matériaux optiques (DI1256)
  • Unités de recherche UMONS : Matériaux Micro et Nanophotoniques (S803)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Physique des matériaux (CRPM)

Abstract(s) :

(Anglais) Metasurfaces are subwavelength spatial variations in geometry and material, and offer us an ingenious way of manipulating far-field radiation. Here, we show that their ability to manipulate the near-field is also an extremely powerful lever in controlling nanophotonic photon-electron interactions. Indeed, the metasurface near-field contains high-order spatial harmonics that can be leveraged to generate substantial high harmonic components, whose properties are directly tunable through the metasurface geometry, the electron energy and the incidence angle of the input laser. By developing an analytical theory that produces results in excellent agreement with our ab initio simulations, we show how the design of metasurface-enhanced plasmons can be leveraged to produce bright and highly-directional multi-harmonic emission in the X-ray and the gamma ray range. As an example, we present the design of a four-color X-ray source, and we discuss how to scale up the output intensity using metamaterials.