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Intersubband Transitions, Infrared Detectors, and Optical Nonlinearities in SiGe Multiquantum Wells

  • M. Helm (a1), P. Kruck (a1), T. Fromherz (a1), M. Seto (a1), G. Bauer (a1), J. F. Nützel (a2) and G. Abstreiter (a1)...

Abstract

A survey is given about the potential use of Si/SiGe heterostructures for applications in the mid-infrared spectral range. We discuss theoretical foundations and experiments of intersubband absorption in p-type Si/SiGe quantum wells and show that due to the complex valence-band structure, normal-incidence absorption can be observed. On the basis of these quantum wells, mid-infrared detectors were fabricated and characterized in terms of responsivity, dark current and detectivity. In asymmetric, compositionally stepped quantum wells second harmonic generation of CO2 laser radiation has been demonstrated.

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Intersubband Transitions, Infrared Detectors, and Optical Nonlinearities in SiGe Multiquantum Wells

  • M. Helm (a1), P. Kruck (a1), T. Fromherz (a1), M. Seto (a1), G. Bauer (a1), J. F. Nützel (a2) and G. Abstreiter (a1)...

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