Noise temperature and beam pattern of an NbN hot electron bolometer mixer at 5.25 THz
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Towards Detection of OH Line at 3.5 THz Using a HEB Mixer and a Distributed Feedback Quantum Cascade Laser
We report the demonstration of a heterodyne receiver for detection of OH lines at 3.5 THz. The receiver uses a superconducting NbN hot electron bolometer integrated with a tight winding spiral antenna as mixer and a THz distributed feedback quantum cascade laser operating at 3.42 THz as local oscillator. We measured a double sideband receiver noise temperature of 2100 K at the optimum local osc...
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Low noise terahertz (THz) receivers based on superconducting niobium nitride (NbN) hot electron bolometer (HEB) mixers 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 a high-resistivity Si substrate. To eliminate the influence of direct det...
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We characterize a heterodyne receiver based on a surface-plasmon waveguide quantum cascade laser (QCL) emitting at 2.84 THz as a local oscillator, and an NbN hot electron bolometer as a mixer. We find that the envelope of the far-field pattern of the QCL is diffraction-limited and superimposed onto interference fringes, which are similar to those found in narrow double-metal waveguide QCLs. Com...
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