Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 38: Halbleiterlaser II

HL 38.4: Talk

Monday, March 7, 2005, 10:45–11:00, TU P-N201

Elevated Temperture Performance of CEO Quantum Wire Cascade Emitter Devices — •Stefan Schmult, Thomas Herrle, Hans-Peter Tranitz, Matthias Reinwald, Christian Gerl, and Werner Wegscheider — Universität Regensburg, Institut für Experimentelle und Angewandte Physik, D-93040 Regensburg

Quantum Wire cascade devices emitting in the Mid-Infrared spectral region have been realised recently by employing the Cleaved Edge Overgrowth (CEO) technique [1,2]. The emission wavelength is about 9 µm with a maximum optical output power of 17 nW at a maximum operating temperautre of 20 K [3]. The limited temperature perfomance of the devices can be attributed to current leakage across the first growth step. We investigated the leak current temperature behavior of several first growth step heterostructures in dependence of their growth temperatures. The resulting emitter devices, operated up to 80 K, showed clear emission at around 10 µm. Polarisation dependent measurements of the emitted light have been carried out to analyse the electronic intersubband transitions between Quantum Wire states in the emitter devices. The talk describes the polarisation and temperature dependent characterisation of the emitter structures.

[1] S. Schmult, I. Keck, T. Herrle, W. Wegscheider, M. Bichler, D. Schuh and G. Abstreiter, Appl. Phys. Lett. 83, 2003. [2] S. Schmult, I. Keck, T. Herrle, W. Wegscheider, A.P. Mayer, M. Bichler, D. Schuh and G. Abstreiter, Physica E 21, 2004. [3] S. Schmult, T. Herrle, H.-P. Tranitz, M. Reinwald, W. Wegscheider, M. Bichler, D. Schuh and G. Abstreiter, to be published in Proceedings of ICPS 27, 2004.