ISSTT Proceedings

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Performance Of An All-NbN Quasi-Optical SIS Mixer For The Terahertz Band

Authors:
Yoshinori Uzawa, Zhen Wang, Akira Kawakami, Shigehito Miki
Abstract:
We designed an all-NbN SIS mixer with low-noise and wideband operation at terahertz frequencies. The mixer consists of a self-compensated NbN/AlN/NbN tunnel junction and an epitaxially grown NbN/MgO/NbN microstripline. The junction as a distributed element is 0.8 µm wide and 2.4 µm long, and its current density is 50 kA/cm². The microstripline consists of a 200-nm-thick NbN ground plane, a 180-nm-thick MgO insulator, and a 350-nm-thick NbN wiring layer. The frequency dependence of the receiver noise temperature was investigated by using an optically pumped far-infrared laser and backward-wave oscillators as local oscillators at frequencies from 760 to 980 GHz. The mixer showed flat noise characteristics at frequencies from 780 to 960 GHz, as predicted in our design process. The lowest receiver noise temperature was about 550 K at 909 GHz, including a 9-µm-thick Mylar beam splitter loss and other optical losses. Some large optical losses may be possible in the quasi-optical receiver configuration based on the standard method of input-loss estimation.
Categories:
SIS Mixers
Year:
2001
Session:
8
Full-text:
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Page Number(s):
352-362