title: One-way glass for microwaves using nonreciprocal metamaterials.
abstract: We introduce a class of nonreciprocal metamaterials based on composite assemblies of metallic and biased ferrimagnetic elements. We show that such structures act as ultrathin one-way glasses due to the competition between two modes at the surface of the ferrimagnetic elements--a low-loss surface wave that transmits the signal on the other side of the structure and a surface spin-wave resonance that produces strong isolation levels. These findings can be adapted to existing metamaterial geometries, offering a blueprint to achieve unidirectional propagation in a variety of artificial media at radio, microwave, and millimeter wave frequencies.
authors.affiliation: Institut d'Electronique Fondamentale, Univ. Paris-Sud and CNRS, UMR 8622, Orsay F-91405, France.
authors.forename: A
authors.initials: A
authors.lastname: Degiron
authors.affiliation: Center for Metamaterials and Integrated Plasmonics and Department of Electrical and Computer Engineering, Duke University, Box 90291, Durham, North Carolina 27708, USA.
authors.forename: D R
authors.initials: DR
authors.lastname: Smith