Development of 0.8 THz and 1.5 THz Waveguide NbTiN HEB Mixers
نویسندگان
چکیده
In this paper, we present results on the noise performance of the waveguide Niobium Titanium Nitride (NbTiN) superconducting hot electron bolometer (HEB) mixers, cryogenically cooled by a 4-K close-cycled refrigerator. The NbTiN superconducting HEB mixer is fabricated on a crystalline quartz substrate, and is mounted in a waveguide mixer block for RF and LO coupling. At 0.81 THz, the uncorrected DSB receiver noise temperature is measured to be 500 K and the noise bandwidth is 1.4 GHz. The same mixer shows the DSB receiver noise temperature of 640 K at 0.65 THz. We also investigate the DC performance of superconducting NbTiN HEB mixer designed for 1.5 THz.
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