T-shaped waveguides for quantum-wire intersubband lasers

Thomas Herrle, Stefan Schmult, Markus Pindl, Ulrich T. Schwarz, and Werner Wegscheider
Phys. Rev. B 72, 035316 – Published 8 July 2005

Abstract

We present a T-shaped waveguide for a quantum-wire intersubband laser in the GaAsAlGaAs heterosystem for the midinfrared spectral region around 8μm. Such a device is fabricated using the cleaved edge overgrowth (CEO) technique. The suggested waveguide structure is compatible to this growth technique. The confinement factor and the waveguide losses due to free carrier absorption are calculated solving the scalar wave equation and compared to the results for a conventional quantum cascade laser (QCL) in the GaAsAlGaAs material system based on coupled quantum-wells. We show that the optical mode can be confined near the active region of a quantum-wire cascade structure with the presented T-shaped waveguide design. Simultaneously the waveguide losses can be reduced compared to a conventional QCL waveguide design. However, the confinement factor is substantially reduced as a result of a small optically active region in the quantum-wire cascade device.

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  • Received 5 January 2005

DOI:https://doi.org/10.1103/PhysRevB.72.035316

©2005 American Physical Society

Authors & Affiliations

Thomas Herrle, Stefan Schmult, Markus Pindl, Ulrich T. Schwarz, and Werner Wegscheider

  • Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93040 Regensburg, Germany

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Issue

Vol. 72, Iss. 3 — 15 July 2005

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