Bi2Sr2CaCu2O8 Intrinsic Josephson junctions as coherent THz emitters

仍然缺乏在太赫兹（THz）范围内工作的良好的有源或无源器件。这些设备将为材料测试或医疗诊断的非破坏性成像或材料和分子的新光谱研究等应用打开一扇窗。由高温超导体Bi_2Sr_2CaCu_2O_8制成的本征约瑟夫森结的堆叠最近已被证明在此范围内工作。本建议的目的是研究本征约瑟夫森结堆的太赫兹辐射。我们的目标是双重的：一方面，我们希望了解和模拟太赫兹产生的机制。特别是在高偏压下，产生THz辐射的热斑和冷区共存，THz产生的机制还不清楚。有必要详细了解，以找到限制，例如，最大发射功率和最小线宽，其可以对于单个叠层或对于叠层阵列实现。第二个任务是在实验基础上优化本征结堆的THz发射，并提供应用演示（例如，G.在光谱学或THz成像方面）。这两部分将在H组之间密切合作下进行。B。Wang（筑波国立材料科学研究所和南京超导电子研究所）、V.P.Koshelets（莫斯科科特尔'nikov无线电工程与电子研究所）和申请人。

There is still a lack of good active or passive devices operating in the Terahertz (THz) range. Such devices would open a window to applications like non-destructive imaging for materials testing or medical diagnosis, or to novel spectroscopic studies of materials and molecules. Stacks of intrinsic Josephson junctions made of the high temperature superconductor Bi2Sr2CaCu2O8 have recently been shown to operate in this regime. The objective of the present proposal is to investigate THz emission from intrinsic Josephson junction stacks. The goals are twofold: On the one hand we want to understand and model the mechanism of THz generation. Particularly, in the high bias regime where a hot spot and a cold region producing the THz radiation coexist, the mechanism of THz generation is not understood well. A detailed understanding will be necessary to find limits on, e.g., the maximum emission power and the minimum linewidth that can be achieved either for single stacks or for arrays of stacks. The second task is to optimize THz emission from intrinsic junction stacks on experimental grounds and offer demonstrations of applications (e. g. in terms of spectroscopy or THz imaging). Both parts will be performed in close collaboration between the groups of H. B. Wang (National Institute of Material Science, Tsukuba and Research Institute of Superconductor Electronics, Nanjing), V. P. Koshelets (Kotel'nikov Institute of Radio Engineering and Electronics, Moskau) and the applicant.