title: Polarization conversion from a thin cavity array in the microwave regime.
abstract: Linearly polarized microwave radiation is shown to have its plane of polarization converted to the orthogonal state upon reflection from an ultrathin (λ/25) cavity array. The structure benefits from an uncomplicated design consisting of a metallic grating closely separated from a ground plane by a dielectric spacer. A single set of periodically spaced slits (monograting) exhibits polarization conversion when the normally incident electric field is aligned at 45° to the slits. Two orthogonal sets of slits (bigrating) allows this narrow-band effect to be broadened when the two orthogonal resonances are separated in frequency. We optimise the design and experimentally demonstrate near loss-less polarization conversion (95% of the incident intensity) across a 3.1 GHz frequency band. Finally, we study the dependence of the structure's performance on incident angle and slit width.
authors: Electromagnetic and Acoustic Materials Group, Department of Physics and Astronomy, University of Exeter, Exeter. EX4 4QL, United Kingdom.
authors: B
authors: B
authors: Tremain
authors: Electromagnetic and Acoustic Materials Group, Department of Physics and Astronomy, University of Exeter, Exeter. EX4 4QL, United Kingdom.
authors: H J
authors: HJ
authors: Rance
authors: Electromagnetic and Acoustic Materials Group, Department of Physics and Astronomy, University of Exeter, Exeter. EX4 4QL, United Kingdom.
authors: A P
authors: AP
authors: Hibbins
authors: Electromagnetic and Acoustic Materials Group, Department of Physics and Astronomy, University of Exeter, Exeter. EX4 4QL, United Kingdom.
authors: J R
authors: JR
authors: Sambles