title: Theory of coupled optical PT-symmetric structures.
abstract: Starting from Lagrangian principles we develop a formalism suitable for describing coupled optical parity-time symmetric systems.
authors.affiliation: College of Optics & Photonics-CREOL, University of Central Florida, Orlando, Florida, 32816 USA.
authors.forename: R
authors.initials: R
authors.lastname: El-Ganainy
authors.forename: K G
authors.initials: KG
authors.lastname: Makris
authors.forename: D N
authors.initials: DN
authors.lastname: Christodoulides
authors.forename: Ziad H
authors.initials: ZH
authors.lastname: Musslimani