Details

Autor(en) / Beteiligte

• Fedorov, K.
• Karataev, P.
• Sahafi, P.
• Antonov, I.
• Asada, M.
• Antonov, V. N.

Titel

Compact Remote Spectral Terahertz Imager

Ist Teil von

• Journal of infrared, millimeter and terahertz waves, 2022-06, Vol.43 (5-6), p.493-502

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2022

Link zum Volltext

Quelle

SpringerLink (Online service)

Beschreibungen/Notizen

• We report on development of an array of spectral sensitive detectors cooled down to 70 K by the compact cryocooler. The spectral sensitive operation of the detectors, explored between 0.16 THz and 0.22 THz, is due to the resonant excitation of the plasma waves in the two-dimensional electron gas of GaAs/AlGaAs heterostructure. A typical responsivity of the detectors is 0.01 A/W at 70 K while it increases by two orders of magnitude when the detector array is cooled down to 0.5 K. The photo-response has surprisingly a narrow peak of spectral sensitivity, ∼ 2–5%, which are highly likely due to the dimensional resonances of the plasma waves. As a demonstration of the spectral sensitive operation we detect a spectral feature of LiNbO 3 crystal at 0.174 THz.