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HL: Halbleiterphysik

HL 16: Semiconductor laser I

HL 16.5: Vortrag

Dienstag, 28. März 2006, 12:00–12:15, BEY 154

Polarization and emission direction dependend measurements on CEO Quantum Wire Cascade Emitter Devices — •Stephan Haneder, Thomas Herrle, Christian Gerl, Dieter Schuh, and Werner Wegscheider — Institut für Experimentielle und Angewandte Physik Universität Regensburg, 93040 Regensburg

We developed a quantum wire cascade device emitting in the Mid-Infrared spectral range by using the Cleaved Edge Overgrowth (CEO) technique [1]. Basic theoretical considerations predict a decrease of non-radiative losses in lower dimensional systems [2]. To investigate the origin of the emitted light and to analyse the electronic intersubband transitions between quantum wire states, polarization and emission direction depend measurements have been carried out. It turns out that the emitted light is TM polarized, but not TE polarized. This can be attributed to the weak confinement in the [110] direction. Temperature dependend measurements show a redshift of the intersubband transition with increasing temperature and a limitation of the performance to about 130 K. We have also performed measurements on quantum wire cascade structures equipped with a T-shaped waveguide [3].
S.Schmult, I.Keck, T.Herrle, W.Wegscheider, M.Bichler, D.Schuh and G.Abstreiter, Appl. Phys. Lett. 83, 1909 (2003). [2] I.Keck, S.Schmult, W.Wegscheider, M.Rother and A.P.Mayer, Phys. Rev. B67, 125212 (2003). [3] T.Herrle, S.Schmult, M.Piendl, U.T.Schwarz and W.Wegscheider, Phys. Rev. B72, 035316 (2005).