title: Wide-angle reflection-mode spatial filtering and splitting with photonic crystal gratings and single-layer rod gratings.
abstract: New diffractive optical elements offering a frequency tolerant, very efficient, high-pass and bandpass spatial filtering over a broad range of incidence angles are demonstrated by numerical simulations. The device operates in reflection mode owing to the (nearly) perfect blazing. It relies on two-dimensional square-lattice photonic crystals composed of dielectric rods with simple corrugations at the interface. Similar performance can be obtained with gratings composed of a single rod layer placed in the near field of a metal mirror, indicating a route to geometries that can be easily fabricated with modern nanotechnologies. Also equal splitting between zero and first negative orders can be obtained for incidence-angle variations that are wider than 60°.
authors.forename: Andriy E
authors.initials: AE
authors.lastname: Serebryannikov
authors.forename: Philippe
authors.initials: P
authors.lastname: Lalanne
authors.forename: Alexander Yu
authors.initials: AY
authors.lastname: Petrov
authors.forename: Ekmel
authors.initials: E
authors.lastname: Ozbay