Distributed feedback ring resonators for vertically emitting terahertz quantum cascade lasers.
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.
Mahler
Lukas
L
NEST, CNR-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126, Pisa, Italy. l.mahler@sns.it
Amanti
Maria I
MI
Walther
Christoph
C
Tredicucci
Alessandro
A
Beltram
Fabio
F
Faist
Jérôme
J
Beere
Harvey E
HE
Ritchie
David A
DA