title: Frequency splitter based on the directional emission from surface modes in dielectric photonic crystal structures.
abstract: We demonstrate the numerical design and the experimental validation of frequency dependent directional emission from a dielectric photonic crystal structure. The wave propagates through a photonic crystal line-defect waveguide, while a surface layer at the termination of the photonic crystal enables the excitation of surface modes and a subsequent grating layer transforms the surface energy into outgoing propagating waves of the form of a directional beam. The angle of the beam is controlled by the frequency and the structure operates as a frequency splitter in the intermediate and far field region.
authors.forename: Anna C
authors.initials: AC
authors.lastname: Tasolamprou
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Maria
authors.initials: M
authors.lastname: Kafesaki
authors.forename: Thomas
authors.initials: T
authors.lastname: Koschny
authors.forename: Costas M
authors.initials: CM
authors.lastname: Soukoulis