title: Spoof-plasmon relevant one-way collimation and multiplexing at beaming from a slit in metallic grating.
abstract: Diode and collimator/multiplexer functions are suggested to be combined in one device that is based on a thin metallic grating with a single subwavelength slit. A proper choice of the structural (a)symmetry of the grating can result in obtaining one-way collimation and multiplexing with a single on-axis or off-axis, or two off-axis narrow outgoing beams. It is possible due to freedom in utilizing different combinations of the excitation conditions of the spoof surface plasmons at the four grating parts - right and left front-side and right and left back-side ones. Such a combining provides one with an efficient tool to engineer one-way collimators and multiplexers with the desired characteristics. Strong asymmetry in transmission with respect to the incidence direction (forward vs backward case) can be obtained within a wide range of variation of the incident beam parameters, i.e., angle of incidence and frequency, while the outgoing radiation is concentrated within a narrow range of the observation angle variation. Most of the observed asymmetric transmission features can be qualitatively explained using the concept of the equivalent source placed inside the slit.
authors.affiliation: Department of Physics, Bilkent University, Bilkent, Ankara, Turkey. semihc@bilkent.edu.tr
authors.forename: Semih
authors.initials: S
authors.lastname: Cakmakyapan
authors.forename: Andriy E
authors.initials: AE
authors.lastname: Serebryannikov
authors.forename: Humeyra
authors.initials: H
authors.lastname: Caglayan
authors.forename: Ekmel
authors.initials: E
authors.lastname: Ozbay
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D006801:Humans; D017785:Photons; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*