Two-dimensional gratings for low polarization dependent wavelength demultiplexing.
Two-dimensional (crossed) diffraction gratings with sinusoidal or truncated pyramidal (trapezoidal) profiles are proposed to have diffraction efficiency almost independent of the incident polarization inside the optical communication spectral window 1.5-1.6 microm. The gratings are characterized by different periods in the two orthogonal directions, chosen to support only one dispersive diffraction order in addition to the zeroth (specular) one.
Hoose
John
J
Institut Fresnel, Unité mixte de recherche de CNRS 6133, Aix-Marseille Université, avenue Escadrille Normandie-Niemen, 13397 Marseille, Cedex 20, France.
Popov
Evgeny
E