High photoresponse in room-temperature quantum cascade detectors based on a coupled-well design

T. Dougakiuchi; K. Fujita; T. Hirohata; A. Ito; M. Hitaka; T. Edamura

doi:10.1117/12.2250468

27 January 2017 High photoresponse in room-temperature quantum cascade detectors based on a coupled-well design

T. Dougakiuchi, K. Fujita, T. Hirohata, A. Ito, M. Hitaka, T. Edamura

Proceedings Volume 10111, Quantum Sensing and Nano Electronics and Photonics XIV; 101112D (2017) https://doi.org/10.1117/12.2250468
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

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^-1Hz^1/2, 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^-1Hz^1/2 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.

Conference Presentation

Citation Download Citation

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 (27 January 2017); https://doi.org/10.1117/12.2250468

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