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Performance and improvement of terahertz quantum-well photodetectors

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Abstract

We report two terahertz quantum-well photodetectors (THz QWPs) in GaAs/AlGaAs quantum wells. Firstly, theoretical work on the influence of many-body effect to the band structure of THz QWPs is conducted and compared with the experimental results [see Fig.1]. Secondly, dark current mechanisms of THz QWPs are systematically investigated experimentally and theoretically by measuring these two newly designed structures combined with samples reported previously [see Fig.2]. Lastly, we propose a scheme, to incorporate an optical antenna which focuses incident THz wave, for improving operation temperature. Numerical results show that the QWP with peak frequency higher than 5.5 THz is expected to achieve background-noise-limited performance (BLIP) at 77 K or above when employing a 106 times enhancement antenna. This work gives good description of many-body effect and dark current mechanism for QWPs in the THz region and is extended to improve BLIP temperatures by introducing an optical enhancement antenna [see Fig.3].

© 2014 Optical Society of America

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