M. Hegedüs, K. Fedorov, I. Antonov, P. Karataev, V. N. Antonov,
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| Optical setup for detection of the blackbody radiation and spectral characterization of the detectors. Blackbody is the thermoelectric module with stabilized temperature in the range of 293–403 K. The THz source is at 177 GHz during this experiment. The blackbody signal is modulated by the chopper at 33 Hz. The THz source is used when assessing the spectral sensitivity of the detectors. The blackbody is at room temperature during these measurements. |
https://aip.scitation.org/doi/abs/10.1063/5.0022533
We detect terahertz radiation emitted by a blackbody object at room temperature. The probe consists of semiconductor detectors coupled to the cold finger of a compact cryo-cooler. The detectors are narrow conductive channels in two-dimensional electron gas, which is sensitive to variations of photon flux through the mechanism of excitation and rectification of plasma waves. The excitation has a resonant nature, with an unexpectedly narrow FWHM, below 10%. The key element of the concept is a compact cryo-platform, which enables us to use highly sensitive cryo-detectors, while keeping the system compact, ∼34 cm side, and mobile. We discriminate the temperature variation of the blackbody object as small as 1.0 K at a distance of 1 m. There is room for further optimization of the detectors and optical systems to boost the temperature resolution down to 0.5 K and the operation distance to 5 m, which are needed for practical applications.
The authors would like to thank Professor P. Teixeira-Dias for reviewing this manuscript. This research was supported by the Russian Science Foundation, Grant No. 16-12-00070 and UK EPSRC Grant No. EP/T004088/1, and the UK government department for Business, Energy and Industrial Strategy. K. Fedorov was supported by the Tomsk Polytechnic University Competitiveness Enhancement Program. The Cassegrain antenna was manufactured at FabLab of Skoltech, Moscow.
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