ZnO-based terahertz quantum cascade lasers |
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Authors: | VP Sirkeli HL Hartnagel |
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Institution: | 1. Institut für Mikrowellentechnik und Photonik, Technische Universität Darmstadt, Merckstraße 25, 64283, Darmstadt, Germany;2. Faculty of Physics and Engineering, Moldova State University, 60 A. Mateevici St., MD-2009, Chisinau, Republic of Moldova |
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Abstract: | High-power terahertz sources operating at room-temperature are promising for many applications such as explosive materials detection, non-invasive medical imaging, and high speed telecommunication. Here we report the results of a simulation study, which shows the significantly improved performance of room-temperature terahertz quantum cascade lasers (THz QCLs) based on a ZnMgO/ZnO material system employing a 2-well design scheme with variable barrier heights and a delta-doped injector well. We found that by varying and optimizing constituent layer widths and doping level of the injector well, high power performance of THz QCLs can be achieved at room temperature: optical gain and radiation frequency is varied from 108 cm?1 @ 2.18 THz to 300 cm?1 @ 4.96 THz. These results show that among II–VI compounds the ZnMgO/ZnO material system is optimally suited for high-performance room-temperature THz QCLs. |
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Keywords: | Corresponding author at: Institut für Mikrowellentechnik und Photonik Technische Universität Darmstadt Merckstraße 25 64283 Darmstadt Germany ZnO MgO ZnMgO Quantum well devices Quantum cascade lasers Terahertz radiation |
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