Four photons sensitivity heterodyne detection of submillimeter radiation with superconducting tunnel junctions
Four photons sensitivity heterodyne detection of submillimeter radiation with superconducting tunnel junctions
复制标题
超导隧道结亚毫米辐射的四光子灵敏度外差探测
DOI：
10.1109/77.403298
复制
发表时间：
1995
影响因子：
1.8
通讯作者：
K. Gundlach
中科院分区：
文献类型：
--
作者：
A. Karpov;J. Blondel;M. Voss;K. Gundlach
已为射电天文学准备了超低噪声 SIS 接收器。最小双边带接收器噪声温度约为 30 K，相当于 2 /spl planck//spl omega//k 或相当于 4 个光子的噪声。测得的最小双边带混频器噪声温度约为 10 K，相当于 0.6 /spl planck//spl omega//k 或大约 1 个光子的噪声。固定调谐 SIS 混频器的工作频率范围为 290-370 GHz。亚微米铌结仅使用光刻胶线制造以进行结定义。该接收机于1994年冬季在西班牙30 m IRAM射电望远镜上使用。当天空不透明度约为0.17时，望远镜系统单边带噪声温度达到了500 K。《ETX》
An ultra low noise SIS receiver has been prepared for radio astronomy. The minimum double sideband receiver noise temperature is about 30 K which corresponds to 2 /spl planck//spl omega//k or an equivalent number of 4 photons of noise. The minimum measured double sideband mixer noise temperature is about 10 K which corresponds to 0.6 /spl planck//spl omega//k or approximately to 1 photon of noise. The fixed tuned SIS mixer operates in the 290-370 GHz frequency range. The submicron niobium junctions mere fabricated using photoresist lines for junction definition. The receiver has been used at the 30 m IRAM radio telescope in Spain in winter 1994. Telescope system noise temperature of 500 K single sideband has been achieved when the sky opacity was about 0.17.<<ETX>>