Herrle, Thomas and Schmult, Stefan and Pindl, Markus and Schwarz, Ulrich T. and Wegscheider, Werner (2005) T-shaped waveguides for quantum-wire intersubband lasers. PHYSICAL REVIEW B, 72 (3): 035316. ISSN 1098-0121,
Full text not available from this repository.Abstract
We present a T-shaped waveguide for a quantum-wire intersubband laser in the GaAs/AlGaAs heterosystem for the midinfrared spectral region around 8 mu m. 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 GaAs/AlGaAs 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CASCADE STRUCTURE; ELECTRON-GAS; MU-M; ELECTROLUMINESCENCE; TEMPERATURE; OPERATION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Werner Wegscheider Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Ulrich Schwarz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 May 2021 06:49 |
| Last Modified: | 10 May 2021 06:49 |
| URI: | https://pred.uni-regensburg.de/id/eprint/35967 |
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