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We report on sub-Terahertz photoconductivity of bulk HgxCd1−xTe crystals with composition close to semiconductor-to-semimetal topological transition. Low magnetic field Shubnikov-de Hass like oscillations were observed with a period which does not depend on the incident frequency. Moreover, anomalous B-periodic oscillations were also observed at higher magnetic fields.
We report on resonant and non-resonant (broad-band) detection of terahertz (THz) radiation using Strained-Si MODFETs. The devices were excited at room temperature by two types of THz sources at 0.292 THz and at 1.5 THz. Non-resonant response with maxima around the threshold voltage was observed. Shubnikov-de Haas along with photoresponse measurements were performed simultaneously to demonstrate that...
Recent results on THz detection by FETs are reported. THz Imaging with FET and detection in quantizing magnetic field. Results of THz Imaging show that FETs arrays are good candidate for real time imaging. In magnetic field we report an enhancement of signal at the cyclotron resonance condition.
THz detection by plasma wave mechanism in InGaAs HEMTs is studied in high/quantizing magnetic fields regime. The correlation between the photovoltaic response and magnetoresistance is revealed. It allows to explain the nature of strong oscillations observed in the transistor Terahertz photoresponse.
An overview is given on recent experimental results in THz detection with high electron mobility transistors. Polarization studies showed clear antenna (directional) effects in detection. Experiments in quantizing magnetic fields allowed us to clarify the role of gated and ungated parts of the channel in detection.
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