title: Surface plasmon photonic structures in terahertz quantum cascade lasers.
abstract: The periodic scattering of the surface plasmon modes employed in the waveguide of terahertz quantum cascade lasers is shown to be an efficient method to control the properties of the laser emission. The scatterers are realized as thin slits in the metal and top contact layer carrying the surface plasmon. This technique provides larger coupling strengths than previously reported and can be used in various device implementations. Here the method is applied to realize a distributed feedback resonator without back-facet reflection, to achieve vertical emission of the radiation with second-order gratings, and to increase the facet reflectivity by fabricating passive distributed Bragg reflectors.
authors.forename: Olivier
authors.initials: O
authors.lastname: Demichel
authors.forename: Lukas
authors.initials: L
authors.lastname: Mahler
authors.forename: Tonia
authors.initials: T
authors.lastname: Losco
authors.forename: Cosimo
authors.initials: C
authors.lastname: Mauro
authors.forename: Richard
authors.initials: R
authors.lastname: Green
authors.forename: Alessandro
authors.initials: A
authors.lastname: Tredicucci
authors.forename: Jihua
authors.initials: J
authors.lastname: Xu
authors.forename: Fabio
authors.initials: F
authors.lastname: Beltram
authors.forename: Harvey E
authors.initials: HE
authors.lastname: Beere
authors.forename: David A
authors.initials: DA
authors.lastname: Ritchie
authors.forename: Vincas
authors.initials: V
authors.lastname: Tamosinuas