Microwave transmission of a compound metal grating.
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.
Hibbins
Alastair P
AP
Electromagnetic Materials Group, School of Physics, University of Exeter, Exeter EX4 4QL, UK.
Hooper
Ian R
IR
Lockyear
Matthew J
MJ
Sambles
J Roy
JR