title: Microwave transmission of a compound metal grating.
abstract: An array of subwavelength slits in a metallic substrate supports a series of Fabry-Perot-like resonances, where each harmonic results in a transmission peak. Addition of extra slits per period yields a compound grating with a structure factor associated with the basis. In this study each repeat period is comprised of a central slit flanked by a pair of narrower slits. It supports three resonances for every Fabry-Perot-like solution. New and useful insight into this phenomenon is gained by describing each of the modes in terms of the band structure of diffractively coupled surface waves.
authors.affiliation: Electromagnetic Materials Group, School of Physics, University of Exeter, Exeter EX4 4QL, UK.
authors.forename: Alastair P
authors.initials: AP
authors.lastname: Hibbins
authors.forename: Ian R
authors.initials: IR
authors.lastname: Hooper
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Lockyear
authors.forename: J Roy
authors.initials: JR
authors.lastname: Sambles