title: Unidirectional invisibility induced by PT-symmetric periodic structures.
abstract: Parity-time (PT) symmetric periodic structures, near the spontaneous PT-symmetry breaking point, can act as unidirectional invisible media. In this regime, the reflection from one end is diminished while it is enhanced from the other. Furthermore, the transmission coefficient and phase are indistinguishable from those expected in the absence of a grating. The phenomenon is robust even in the presence of Kerr nonlinearities, and it can also effectively suppress optical bistabilities.
authors.affiliation: Department of Physics, Wesleyan University, Middletown, Connecticut 06459, USA.
authors.forename: Zin
authors.initials: Z
authors.lastname: Lin
authors.forename: Hamidreza
authors.initials: H
authors.lastname: Ramezani
authors.forename: Toni
authors.initials: T
authors.lastname: Eichelkraut
authors.forename: Tsampikos
authors.initials: T
authors.lastname: Kottos
authors.forename: Hui
authors.initials: H
authors.lastname: Cao
authors.forename: Demetrios N
authors.initials: DN
authors.lastname: Christodoulides