One-way glass for microwaves using nonreciprocal metamaterials

TitleOne-way glass for microwaves using nonreciprocal metamaterials
Publication TypeJournal Article
Year of Publication2014
AuthorsA. Degiron, D.R. Smith
JournalPhysical Review E
Date Published05/2014

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.