Detection of black body radiation using a compact terahertz imager. / Hegedus, Marius; Fedorov, Kirill; Antonov, Ilya; Karataev, Pavel; Antonov, Vladimir.

In: Applied Physics Letters, Vol. 117, 231106, 09.12.2020.

Research output: Contribution to journalArticlepeer-review

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Abstract

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 1.0K 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 0.5K and the operation distance to 5 m, which are needed for practical applications.
Original languageEnglish
Article number231106
JournalApplied Physics Letters
Volume117
DOIs
Publication statusPublished - 9 Dec 2020
This open access research output is licenced under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

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