A high photoresponse in a room-temperature quantum cascade detector (QCD) based on a coupled quantum-well design is demonstrated with a peak detection wavelength of 5.4 μm. In this design, forward electron transfer is engineered to be five times as large as relaxation back to ground level. In this situation, the coupled quantum-well QCD indicates a high responsivity of 22 mA/W as well as a specified detectivity (D*) of 8.0×107 cmW-1Hz1/2, both at room-temperature with commonly used 45° wedge configuration. Applying a waveguide configuration for the proposed QCD, an elevated responsivity of ~130 mA/W with a D* of 1.1×108 cmW-1Hz1/2 was obtained at room-temperature. A laser absorption spectroscopy for N2O gas with proposed QCD and a distributed feedback quantum cascade laser has been also demonstrated.
T. Dougakiuchi, K. Fujita, T. Hirohata, A. Ito, M. Hitaka, and T. Edamura, "High photoresponse in room-temperature quantum cascade detectors based on a coupled-well design," Proc. SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV, 101112D (Presented at SPIE OPTO: February 02, 2017; Published: 27 January 2017); https://doi.org/10.1117/12.2250468.
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