title: Reconfigurable directional lasing modes in cavities with generalized PT symmetry.
abstract: We introduce a new family of generalized PT-symmetric cavities that involve gyrotropic elements and support reconfigurable unidirectional lasing modes. We derive conditions for which these modes exist and investigate a simple electronic circuit that experimentally demonstrates their feasibility in the radio-frequency domain.
authors.affiliation: Department of Physics, Wesleyan University, Middletown, Connecticut 06459, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Lee
authors.affiliation: Department of Physics, Wesleyan University, Middletown, Connecticut 06459, USA.
authors.forename: S
authors.initials: S
authors.lastname: Factor
authors.affiliation: Department of Physics, Wesleyan University, Middletown, Connecticut 06459, USA and School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Z
authors.initials: Z
authors.lastname: Lin
authors.affiliation: Air Force Research Laboratory, Sensors Directorate, Wright Patterson AFB, Ohio 45433, USA.
authors.forename: I
authors.initials: I
authors.lastname: Vitebskiy
authors.affiliation: Department of Physics, Wesleyan University, Middletown, Connecticut 06459, USA.
authors.forename: F M
authors.initials: FM
authors.lastname: Ellis
authors.affiliation: Department of Physics, Wesleyan University, Middletown, Connecticut 06459, USA.
authors.forename: T
authors.initials: T
authors.lastname: Kottos