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Superconducting Integrated THz Receivers

V. P. Koshelets, Pavel N. Dmitriev, Andrey B. Ermakov, Lyudmila V. Filippenko, Andrey V. Khudchenko, Nickolay V. Kinev, Pavel V. Kudryashov, Oleg S. Kiselev, Mikhail Yu. Torgashin, Gert J. de Lange, L. de Jong, Pavel A. Yagoubov

Published Mar 1, 2010• 0 citations
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Optics Express•Feb 12, 2015•12 citations
In this paper, we present a low noise integrated heterodyne receiver at 2.7 THz. This heterodyne receiver is based on a superconducting hot electron bolometer (HEB) mixer and a low power consumption quantum cascade laser (QCL) that are both integrated on the same 4 K stage of a pulse tube cooler. We measured the noise temperature of the HEB/QCL integrated heterodyne receiver by using hot and cold blackbody loads in vacuum. The lowest double sideband receiver noise temperature is about 1000 K at 2.7 THz, and reduced to 500 K after eliminating the quasi-optical losses. In addition, the HEB/QCL integrated heterodyne receiver demonstrates an intermediate frequency (IF) noise bandwidth of 4 GHz.
We demonstrate for the first time the integration of a superconducting hot electron bolometer (HEB) mixer and a quantum cascade laser (QCL) on the same 4-K stage of a single cryostat, which is of particular interest for terahertz (THz) HEB/QCL integrated heterodyne receivers for practical applications. Two key issues are addressed. Firstly, a low power consumption QCL is adopted for preventing its heat dissipation from destroying the HEB's superconductivity. Secondly, a simple spherical lens located on the same 4-K stage is introduced to optimize the coupling between the HEB and the QCL, which has relatively limited output power owing to low input direct current (DC) power. Note that simulation techniques are used to design the HEB/QCL integrated heterodyne receiver to avoid the need for mechanical tuning. The integrated HEB/QCL receiver shows an uncorrected noise temperature of 1500 K at 2.7 THz, which is better than the performance of the same receiver with all the components not integrated.