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Terahertz (THz) direct detectors based on superconducting niobium nitride (NbN) hot electron bolometers (HEBs) with microwave (MW) injection have been studied. Compared to the thermal biasing method, the injected MW is used here to bias the HEB to the optimum point. MW can be expected to be used as the easy read out for the detecting array. The used NbN HEB has an excellent performance as heterodyne...
Short-range wireless terahertz (THz) communication and ultrafast THz interconnects require switches and modulators. Here, we experimentally show voltage-bias superconducting (SC) niobium nitride (NbN) metamaterial to realize a switch. The obtained maximum transmission coefficient at 0.507 THz is up to 0.98 and it drops to 0.19 when the applied voltage is only increased to 0.9 V. A relative transmittance...
This paper presents a terahertz (THz) spectrometer based on high temperature superconducting Josephson junction. The YBa2Cu3O7 (YBCO) bi-crystal Josephson junctions (JJS) with log-periodic antennas are used as detectors. In the low temperature, with the signal measurement, data acquisition and human-computer interactive system, the automatic measurement system of THz spectrometer is finally accomplished...
A system to detect the terahertz (THz) pulse signals has been studied based on the superconducting NbN hot electron bolometer (HEB) detectors, which has the noise equivalent power (NEP) of 9×10−12 W/√Hz, together with a Fourier transform spectrometer (FTS). The detector has been driven by an easily adjustable microwave source to its best bias working point, and its output shown a linear relationship...
A prototype flexural ultrasound transducer capable of operating at high temperatures was designed for noncontact measurement applications. A doped bismuth titanate was used as the piezoelectric element; the construction of the transducer was designed using materials and bonding capable of operating at temperatures up to 500°C. The bismuth titanate was characterised by X-ray diffraction, differential...
Superconducting niobium nitride (NbN) hot electron bolometer (HEB) mixers at terahertz (THz) have been designed, fabricated and measured for applications in astronomy and cosmology. The NbN HEB mixer consists of a planar antenna and an NbN bridge connecting across the antenna's inner terminals on high-resistivity Si substrates. Double sideband (DSB) receiver noise temperatures of 698 K at 0.65 THz,...
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