| DOI | Trouver le DOI : https://doi.org/10.1063/1.4807580 |
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| Auteur | Rechercher : Razavipour, S. G.; Rechercher : Dupont, E.1; Rechercher : Fathololoumi, S.1; Rechercher : Chan, C. W. I.; Rechercher : Lindskog, M.; Rechercher : Wasilewski, Z. R.1; Rechercher : Aers, G.2; Rechercher : Laframboise, S. R.1; Rechercher : Wacker, A.; Rechercher : Hu, Q.; Rechercher : Ban, D.; Rechercher : Liu, H. C. |
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| Affiliation | - Conseil national de recherches du Canada. Technologies de l'information et des communications
- Conseil national de recherches du Canada. Technologies de sécurité et de rupture
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| Format | Texte, Article |
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| Sujet | Coupling strengths; Fabricated device; Injection currents; Metal-metal waveguides; Non-equilibrium Green's function; Oscillator strengths; Population inversions; Terahertz quantum-cascade lasers; Gallium arsenide; Gold; Semiconducting gallium; Quantum cascade lasers |
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| Résumé | We designed and demonstrated a terahertz quantum cascade laser based on indirect pump injection to the upper lasing state and phonon scattering extraction from the lower lasing state. By employing a rate equation formalism and a genetic algorithm, an optimized active region design with four-well GaAs / Al0.25 Ga0.75 As cascade module was obtained and epitaxially grown. A figure of merit which is defined as the ratio of modal gain versus injection current was maximized at 150 K. A fabricated device with a Au metal-metal waveguide and a top n+ GaAs contact layer lased at 2.4 THz up to 128.5 K, while another one without the top n+ GaAs lased up to 152.5 K (1.3ω/kB). The experimental results have been analyzed with rate equation and nonequilibrium Green's function models. A high population inversion is achieved at high temperature using a small oscillator strength of 0.28, while its combination with the low injection coupling strength of 0.85 meV results in a low current. The carefully engineered wavefunctions enhance the quantum efficiency of the device and therefore improve the output optical power even with an unusually low injection coupling strength. |
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| Date de publication | 2013-05-29 |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 21270464 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 8241dee6-ff57-401f-9626-fe7fcbd7ffc7 |
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| Enregistrement créé | 2014-02-12 |
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| Enregistrement modifié | 2020-04-22 |
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