تقرير
A phonon scattering assisted injection and extraction based terahertz quantum cascade laser
| العنوان: | A phonon scattering assisted injection and extraction based terahertz quantum cascade laser |
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| المؤلفون: | Dupont, E., Fathololoumi, S., Wasilewski, Z. R., Aers, G., Laframboise, S. R., Lindskog, M., Wacker, A., Ban, D., Liu, H. C. |
| سنة النشر: | 2012 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | A novel lasing scheme for terahertz quantum cascade lasers, based on consecutive phonon-photon-phonon emissions per module, is proposed and experimentally demonstrated. The charge transport of the proposed structure is modeled using a rate equation formalism. An optimization code based on a genetic algorithm was developed to find a four-well design in the $\mathrm{GaAs/Al_{0.25}Ga_{0.75}As}$ material system that maximizes the product of population inversion and oscillator strength at 150 K. The fabricated devices using Au double-metal waveguides show lasing at 3.2 THz up to 138 K. The electrical characteristics display no sign of differential resistance drop at lasing threshold, which suggests - thanks to the rate equation model - a slow depopulation rate of the lower lasing state, a hypothesis confirmed by non-equilibrium Green's function calculations. Comment: 11 pages, 10 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/1.3702571 |
| URL الوصول: | http://arxiv.org/abs/1201.4189 |
| رقم الأكسشن: | edsarx.1201.4189 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/1.3702571 |
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