Terahertz quantum cascade lasers based on two-dimensional photonic crystal resonators.
We demonstrate high spectral control from surface emitting THz Quantum Cascade Lasers based on a two-dimensional photonic crystal cavity. The perforated top metallic contact acts as an in plane resonator in a tight double-metal plasmonic waveguide providing a strong optical feedback without needing three-dimensional cavity features. The optical far-field patterns do not exhibit the expected symmetry and the shape of the cavity mode. The difference is attributed to a metal surface plasmon mediated light outcoupling mechanism also responsible for the relatively low extraction efficiency.
Institute of Physics, University of Neuchâtel, CH-2000 Neuchâtel, Switzerland. lorenzo.sirigu@unine.ch
Lorenzo
L
Sirigu
Romain
R
Terazzi
Maria I
MI
Amanti
Marcella
M
Giovannini
Jèrome
J
Faist
L Andrea
LA
Dunbar
Romuald
R
Houdré
D003460:Crystallization / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007259:Infrared Rays; D054023:Lasers, Semiconductor; D017785:Photons; D020349:Surface Plasmon Resonance / Q000295:instrumentation*