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Interface Phonon Modes in Quantum Cascade Lasers |
| YU Bing1,2;CAO Jun-Cheng1;FENG Song-Lin1 |
| 1State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050
2Graduate School of Chinese Academy of Sciences, Beijing 100049 |
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| Cite this article: |
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YU Bing, CAO Jun-Cheng, FENG Song-Lin 2005 Chin. Phys. Lett. 22 2403-2406 |
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Abstract We investigate the interface phonon assisted transition in GaAs/AlGaAs quantum cascade lasers (QCLs) by using the transfer matrix method based on the dielectric continuum model. Electron eigenvalues and eigenstates are calculated by solving Schrödinger equation and the Poisson equation self-consistently. The AlAs-like and upper GaAs-like interface phonon modes contribute most of the scattering rate. Interface phonon modes couple strongly with electrons at E2, and the magnitude of scattering rate between E2 and E1 is much larger than that between E3 and E1, which is helpful for the laser inversion between E3 and E2. The calculation can be easily applied to the design and simulation of QCLs.
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| Keywords:
78.67.De
63.20.Kr
72.10.Di
42.55.Px
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Published: 01 September 2005
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| PACS: |
78.67.De
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(Quantum wells)
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63.20.Kr
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72.10.Di
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(Scattering by phonons, magnons, and other nonlocalized excitations)
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42.55.Px
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(Semiconductor lasers; laser diodes)
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