采用嵌入Fabry—Perot谐振腔的方式,测量并研究Tl2Ba2CaCu2O8(T1—2212)高温超导薄膜双晶约瑟夫森结的毫米波辐照特性。通过精细调节谐振腔的各种参数,可使双晶约瑟夫森结与外加毫米波达到最佳耦合,在最佳耦合情况下,能观察到5级明显的夏皮罗台阶。初步测量了由667个双晶约瑟夫森结组成的串联结阵列的毫米波辐射特性,得到中心频率为78.7GHz。大约6pW的辐射功率。
The mm-wave irradiation characteristics of Tl2Ba2CaCu2O8 (Tl-2212),a high temperature superconducting thin film bicrystal Josephson junction embedded in a hemispherical Fabry-Perot resonator, is studied. The optimized coupling between Josephson junction and applied microwave is achieved by subtle adjustment of the various factors of resonator. 5 orders distinct Shapiro steps are observed. The radiation property of serial array consisting of 667 bicrystal Josephson junctions is measured and the radiation power is approximately 6 pW at 78.7 GHz center frequency.