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Physica C Superconductivity

Slot antenna coupled YBa2Cu3O7−δ hot-electron bolometers for millimeter-wave radiation

Takashi Uchida, Hirokazu Yazaki, Yoshizumi Yasuoka, Katsumi Suzuki

Published Aug 1, 2001• 10 citations
Publisher
DOI
10.1016/s0921-4534(01)00560-3

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We highlight the progress on NbN hot electron bolometer (HEB) mixers achieved through fruitful collaboration between SRON Netherlands Institute for Space Research and Delft University of Technology, the Netherlands. This includes the best receiver noise temperatures of 700 K at 1.63 THz using a twin-slot antenna mixer and 1050 K at 2.84 THz using a spiral antenna coupled HEB mixer. The mixers are based on thin NbN films on Si and fabricated with a new contact-process and-structure. By reducing their areas HEB mixers have shown an LO power requirement as low as 30 nW. Those small HEB mixers have demonstrated equivalent sensitivity as those with large areas provided the direct detection effect due to broadband radiation is removed. To manifest that a HEB based heterodyne receiver can in practice be used at arbitrary frequencies above 2 THz, we demonstrate a 2.8 THz receiver using a THz quantum cascade laser (QCL) as local oscillator.