| Presentation | 1997/4/23 All-NbN Quasi-Optical SIS Mixers at Terahertz Frequencies Yoshinori Uzawa, Zhen Wang, Akira Kawakami, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We have theoretically and experimentally investigated submillimeter-wave receiver performances employing NbN/AlN/NbN tunnel junctions with high current dinsity and high energy gap. The receiver noise performances based on parameters for our typical NbN SIS junction were analyzed using Tucker's quantum theory of mixing, which showed that DSB receiver noise temperatures of below 3hv/K_B can be achieved by using our NbN junctions for frequencies up to 2 THz. We designed and tested quasi-optical receivers with integrated tuning circuits for the 300 GHz and l THz bands. The lowest receiver noise temperature measured using the standard Y-factor method was 136 K(DSB) at around the design frequency of 300 GHz, which demonstrate that our NbN/AlN/NbN tunnel junctions have great potential as submillimeter-wave SIS mixers. For the 1 THz receiver, however, the receiver noise temperature was about 2700 K at 761 GHz, which is much larger than the theoretical prediction. The relative high noise performance may be caused by the large RF losses in the tuning circuit of polycristalline NbN on the SiO. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | NbN/AlN/NbN junction / THz / Quasi-optical receiver / Tuning circuit / RF loss |
| Paper # | SCE97-5,MW97-5 |
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| Conference Information | |
| Committee | SCE |
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| Conference Date | 1997/4/23(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Superconductive Electronics (SCE) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | All-NbN Quasi-Optical SIS Mixers at Terahertz Frequencies |
| Sub Title (in English) | |
| Keyword(1) | NbN/AlN/NbN junction |
| Keyword(2) | THz |
| Keyword(3) | Quasi-optical receiver |
| Keyword(4) | Tuning circuit |
| Keyword(5) | RF loss |
| 1st Author's Name | Yoshinori Uzawa |
| 1st Author's Affiliation | Kansai Advanced Research Center, Communications Research Laboratory() |
| 2nd Author's Name | Zhen Wang |
| 2nd Author's Affiliation | Kansai Advanced Research Center, Communications Research Laboratory |
| 3rd Author's Name | Akira Kawakami |
| 3rd Author's Affiliation | Kansai Advanced Research Center, Communications Research Laboratory |
| Date | 1997/4/23 |
| Paper # | SCE97-5,MW97-5 |
| Volume (vol) | vol.97 |
| Number (no) | 19 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |