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2014-11-03 - Colloque/Présentation - poster - Anglais - 1 page(s)

Rivolta Nicolas, Maes Bjorn , "Switching of free space diffraction with a tailored PT symmetric grating" in 19th annual Symposium of the IEEE Photonics Society Benelux Chapter, 978-90-365-3778-0, 125-128, Twente (Enschede), Pays-Bas, 2014

  • 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) We numerically study the diffraction properties of a parity-time (PT) symmetric transmission grating. This kind of grating consists of a periodic structure with balanced real and imaginary parts of the refractive index. We tailor the geometry and phase of the structure to achieve high diffraction efficiencies in only two diffraction orders. The combination of gain and loss creates the PT symmetric behaviour: a critical, symmetry-breaking point is reached when the imaginary part is increased. The different characteristics around the critical point in our tailored grating are analyzed, and the device can function as an efficient switching device.