title: A 2×2 spatial optical switch based on PT-symmetry.
abstract: We show a PT-symmetric coupler having an arm with a tunable gain and a no-loss arm when appropriately designed to possess reciprocal behavior, unlike its rivals having a fixed gain/loss arm, can perform as a tunable 2×2 spatial optical switch. The degree of the tunability equals the ratio of the coupler's length to the total coupling length.
authors.affiliation: Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran.
authors.forename: Fakhroddin
authors.initials: F
authors.lastname: Nazari
authors.forename: Mina
authors.initials: M
authors.lastname: Nazari
authors.forename: Mohammad Kazem
authors.initials: MK
authors.lastname: Moravvej-Farshi