title: Distributed feedback ring resonators for vertically emitting terahertz quantum cascade lasers.
abstract: We present distributed-feedback Terahertz quantum cascade lasers operating in a double-metal ring waveguide. High power collimated emission in a single spectral mode is observed in the vertical direction. A double-slit configuration is employed to achieve both good electrical contacts and efficient power out-coupling. The optical properties of the devices are interpreted with the aid of finite element simulations.
authors: NEST, CNR-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126, Pisa, Italy. l.mahler@sns.it
authors: Lukas
authors: L
authors: Mahler
authors: Maria I
authors: MI
authors: Amanti
authors: Christoph
authors: C
authors: Walther
authors: Alessandro
authors: A
authors: Tredicucci
authors: Fabio
authors: F
authors: Beltram
authors: Jérôme
authors: J
authors: Faist
authors: Harvey E
authors: HE
authors: Beere
authors: David A
authors: DA
authors: Ritchie