title: PT metamaterials via complex-coordinate transformation optics.
abstract: We extend the transformation-optics paradigm to a complex spatial coordinate domain, in order to deal with electromagnetic metamaterials characterized by balanced loss and gain, giving special emphasis to parity-time (PT) symmetric metamaterials. We apply this general theory to complex-source-point radiation and anisotropic transmission resonances, illustrating the capability and potentials of our approach in terms of systematic design, analytical modeling, and physical insights into complex-coordinate wave objects and resonant states.
authors.affiliation: Waves Group, Department of Engineering, University of Sannio, I-82100 Benevento, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Castaldi
authors.forename: Silvio
authors.initials: S
authors.lastname: Savoia
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Galdi
authors.forename: Andrea
authors.initials: A
authors.lastname: Alù
authors.forename: Nader
authors.initials: N
authors.lastname: Engheta