Compact Superconducting Terahertz Source Operating in Liquid Nitrogen

L. Y. Hao, M. Ji, J. Yuan, D. Y. An, M. Y. Li, X. J. Zhou, Y. Huang, H. C. Sun, Q. Zhu, F. Rudau, R. Wieland, N. Kinev, J. Li, W.W. Xu, B. B. Jin, J. Chen, T. Hatano, V. P. Koshelets, D. Koelle, R. Kleiner, H. B. Wang, and P. H. Wu Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210093, People’s Republic of China National Institute for Materials Science, Tsukuba 3050047, Japan Physikalisches Institut and Center for Collective Quantum Phenomena in LISA, Universitat Tubingen, D-72076 Tubingen, Germany Kotel’nikov Institute of Radio Engineering and Electronics, 125009 Moscow, Russia Cooperative Innovation Centre of Terahertz Science, Chengdu 610054, People’s Republic of China (Received 3 November 2014; revised manuscript received 24 December 2014; published 19 February 2015)