Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 42: Focussed Session: Silicon Photonics

HL 42.5: Hauptvortrag

Mittwoch, 24. März 2010, 16:15–16:45, H13

SiGe based quantum cascade systems: 10 years after. — •Hans Sigg — Paul Scherrer Institut, Villigen PSI, Switzerland

The exploration of a Si-technology based long-wavelength laser for gas sensing, medical screening and airport security monitoring etc., started ten years ago, with the demonstration of electro-luminescence in SiGe based quantum cascade structures [Dehlinger, Diehl et al. Science 290, 2277 (2000)]. At the beginning, most activities focused on the development of a relaxed buffer substrate, and the implementation of intersubband systems in the valence band, i.e. cascade emitters based on hole-transport. Recently, despite the reduced band offsets, intersubband systems in the conduction band have come into the focus, because of their simpler bandstructure. Alternative approaches, such as optical pumping and intersubband Raman lasing have also been investigated. The present outline of these basic developments allows the remaining significant technological and fundamental problems to be brought into perspective.