Coherent THz emission of Bi_2Sr_2CaCu_2O_8 intrinsic Josephson junction stacks in the hot spot regime

  title={Coherent THz emission of Bi\_2Sr\_2CaCu\_2O\_8 intrinsic Josephson junction stacks in the hot spot regime},
  author={Hua-bing Wang and Stefan Gu{\'e}non and Boris Gross and J Yuan and Zhenguo Jiang and Y. Y. Zhong and M. Gruenzweig and A. Iishi and Peiheng Wu and Takeshi Hatano and Dieter Koelle and Reinhold Kleiner},
  journal={Physical Review Letters},
We report on THz emission measurements and low temperature scanning laser imaging of Bi_2Sr_2CaCu_2O_8 intrinsic Josephson junction stacks. Coherent emission is observed at large dc input power, where a hot spot and a standing wave, formed in the "cold" part of the stack, coexist. By varying the hot spot size the cavity resonance frequency and the emitted radiation can be tuned. The linewidth of radiation is much smaller than expected from the quality factor of the cavity mode excited. Thus, an… 

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