タイトル | Fabrication of superconducting direct detectors in submillimeter-wave bands |
その他のタイトル | サブミリメートル波バンドにおける超伝導直接検出器の製作 |
著者(日) | 有吉 誠一郎; 松尾 宏; 大谷 知行; 森嶋 隆裕; 佐藤 広海; 清水 裕彦 |
著者(英) | Ariyoshi, Seiichiro; Matsuo, Hiroshi; Otani, Chiko; Morishima, Takahiro; Sato, Hiromi; Shimizu, Hirohiko M. |
著者所属(日) | 総合研究大学院大学; 国立天文台 天文機器開発実験センター; 理化学研究所; 理化学研究所 情報基盤研究部 イメージ情報技術開発室; 理化学研究所 情報基盤研究部 イメージ情報技術開発室; 理化学研究所 情報基盤研究部 イメージ情報技術開発室 |
著者所属(英) | Graduate University for Advanced Studies; National Astronomical Observatory Advanced Technology Center; Institute of Physical and Chemical Research; Institute of Physical and Chemical Research Image Information Division, Advanced Computing Center; Institute of Physical and Chemical Research Image Information Division, Advanced Computing Center; Institute of Physical and Chemical Research Image Information Division, Advanced Computing Center |
発行日 | 2002-07 |
発行機関など | Institute of Physical and Chemical Research |
刊行物名 | RIKEN Review RIKEN Review |
号 | 47 |
開始ページ | 43 |
終了ページ | 47 |
刊行年月日 | 2002-07 |
言語 | eng |
抄録 | Direct detectors of submillimeter-wave radiation based on Nb/Al/AlOx/Al/Nb superconducting tunnel junctions (STJs) will be powerful tools for astronomical continuum observations in submillimeter-wave bands. To realize the detectors based on photon-assisted tunneling with wide frequency coverage, it is necessary to fabricate extremely high-quality STJs with very small areas (4 sq micrometer), high Josephson critical current densities (1000 A/sq-cm), and very low leakage currents below 10 pico-ampere at 0.3 K. The noise equivalent power (NEP) of the detectors is expected to be an order of 10(exp -18) W/(square-root of Hz) at the operating temperature below 0.7 K. The development of the direct detectors have been started using the fabrication facility at RIKEN. By improving the fabrication process using anodization of the junction edge, it has been successful to fabricate the small and high-quality STJs with the high critical current density of about 1000 A/sq-cm, the low leakage current of less than 100 pA, and the high fabrication yield of more than 90 percent. |
キーワード | superconducting direct detector; junction edge; low leakage current; submillimeter wave; critical current density; TEM; radio astronomy; galaxy; 超伝導直接検出器; 接合端; 低い漏れ電流; サブミリメートル波; 臨界電流密度; TEM; 電波天文学; 銀河 |
資料種別 | Conference Paper |
ISSN | 0919-3405 |
SHI-NO | AA0035537011 |
URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/44060 |