Herrle, Thomas and Haneder, Stephan and Wegscheider, Werner (2006) Role of excited states for the material gain and threshold current density in quantum wire intersubband laser structures. PHYSICAL REVIEW B, 73 (20): 205328. ISSN 1098-0121,
Full text not available from this repository.Abstract
We calculated the material gain and the threshold current density for quantum wire intersubband laser structures. In quantum cascade laser devices with active regions of lower dimensionality a reduction of the nonradiative losses and consequently an increase in the material gain and a reduction of the threshold current density is predicted. In our calculations of the material gain and the threshold current density for a realistic quantum wire intersubband laser structure fabricated by the cleaved edge overgrowth (CEO) technique, however, it turns out that excited states formed in those structures even reduce the material gain compared to conventional quantum well cascade lasers. The threshold current density also turns out to be increased due to the reduced material gain on the one hand and due to a small optical confinement factor in such structures on the other hand. The main consequence for the design of such quantum wire laser structures is to avoid the formation of excited states to be able to benefit from the reduction of the dimensionality of the electron system in terms of reduced nonradiative losses.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CASCADE LASERS; ELECTROLUMINESCENCE; SCATTERING; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Werner Wegscheider |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Feb 2021 13:25 |
| Last Modified: | 15 Feb 2021 13:26 |
| URI: | https://pred.uni-regensburg.de/id/eprint/34611 |
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