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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.
Transistors are possible THz detectors using rectification in the channel that can be applied for detection of high data-rate wireless communications, based on THz-frequency carrier. For the first time, we present the transmission of pseudo-random bit sequence at 0.2 THz using a commercial GaAs transistor and demonstrate open eye patterns up to 0.250 Gbps.
We present experimental study of terahertz detection by asymmetric dual-grating gate HEMT structures. The separate contributions of the gate leakage current and the loading effect to the rectification signal in the sub-threshold region was investigated versus temperature and frequency range.
We observed and characterized broadband terahertz emission from our original plasmon-resonant emitter structured by dual-grating gate high electron mobility transistors (HEMT's). The samples are fabricated in two structures: a standard single-heterostructure HEMT with metallic grating gates and a double-decked (DD) HEMT with semiconducting 2-dimensional electron gas (2DEG) grating gates. The mechanism...
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