Split-well direct-phonon terahertz quantum cascade lasers

Performance of Phonon Depopulated Terahertz Quantum Cascade Lasers

Ch. Deutsch1, A. Benz1, G. Fasching1, K. Unterrainer1, A. M. Andrews2, P. Klang2, W. Schrenk2, and G. Strasser2 1 Photonics Institute and Center for Microand Nanostructures, Vienna University of Technology, Gusshausstrasse 29/387, 1040 Vienna, Austria 2 Institute of Solid-State Electronics and Center for Microand Nanostructures, Vienna University of Technology, Floragasse 7/362, 1040 Vienna, Au...

Terahertz quantum cascade lasers based on intra-well optical transitions

The possibility to achieve laser action at different THz frequencies employing the so-called vertical transition will be discussed. The intra-well or vertical optical transition presents a number of features that makes it an ideal candidate for a systematic study of resonant tunnelling and dephasing in quantum cascade lasers. Laser action at 3.5 THz with very low threshold employing a single qu...

Two-well terahertz quantum cascade lasers with suppressed carrier leakage

Nanowire terahertz quantum cascade lasers

Terahertz photonic crystal quantum cascade lasers.

We combine photonic crystal and quantum cascade band engineering to create an in-plane laser at terahertz frequency. We demonstrate that such photonic crystal lasers strongly improve the performances of terahertz quantum cascade material in terms of threshold current, waveguide losses, emission mode selection, tunability and maximum operation temperature. The laser operates in a slow-light regi...