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The 9th International Symposium on Intrinsic Josephson Effects and THz Plasma Oscillations in High-Tc Superconductors (THz-PLASMA 2014) Kyoto Univ., Kyoto, Japan, November 30- December 3, 2014

Some Efforts on Improving Performance and Understanding Mechanism of THz Emission in Intrinsic Josephson Junctions
H. B. Wanga, b, *, X. J. Zhoua, b, M. Jia, b, Y. Huanga, b, D. Y. Ana, b, N. Kinevc, A. Sobolevc, B. Grossd, F. Rudaud, T. Hatanoa, V. P. Kosheletsc, D. Koelled, R. Kleinerd, W. W. Xub, and P. H. Wub
b

National Institute for Materials Science, Tsukuba 3050047, Japan Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210093, China c Kotel'nikov Institute of Radio Engineering and Electronics, Moscow 125009, Russia d Physikalisches Institut and Center for Collective Quantum Phenomena in LISA+, UniversitДt TЭbingen, D-72076 TЭbingen, Germany Corresponding author E-mail address: wang.huabing@nims.go.jp
*

a

[keywords] Intrinsic Josephson junctions, THz emission, Hotspots and standing waves, Low temperature scanning laser microscopy In recent years coherent terahertz (THz) radiation from stacks containing hundreds of Bi2Sr2CaCu2O8 (BSCCO) intrinsic Josephson junctions (IJJs) has attracted a lot of research interest [1-6]. However, in most cases, reported have been frequencies well below 1 THz, or typically around 500 GHz, which obviously can be a bottleneck for many applications. In addition, the mechanism of THz emission in IJJS is still open for discussion. In our study, by optimizing sample structures and material doping levels, we successfully observed THz radiation at fundamental frequencies up to 1.1 THz. We also developed a home-made system, by combining a low-temperature scanning laser microscope (LTSLM) and a THz interferometer. With this setup, we are able to detect THz emission and observe LTSLM images simultaneously. In this talk, we will report the emission over 1 THz obtained in a sandwich structure, the unambiguous observation of the correlation between the standing wave patterns, the hotspot formation and the THz radiation [7-9], and some other efforts on improving performance and understanding mechanism of THz emission in intrinsic Josephson junctions

We gratefully acknowledge financial support by the National Natural Science Foundation of China (Grant 11234006), the Deutsche Forschungsgemeinschaft (Project KL930/12-1), the Grants-in-Aid for scientific research from JSPS, and RFBR grants 13-02-00493-a, and 14-0291335.
References [1] R. Kleiner et al., Phys. Rev. Lett. 68, 2394 (1992). [2] L. Ozyuzer et al., Science 318, 1291 (2007). [3] H. B. Wang et al., Phys. Rev. Lett. 102, 017006 (2009). [4] H. B. Wang et al., Phys. Rev. Lett. 105, 057002 (2010). [5] M. Tsujimoto et al., Phys. Rev. Lett. 105, 037005 (2010). [6] T. Kashiwagi et al., J. J. Appl. Phys. 51, 010113 (2012). [7] D. Y. An et al., Appl. Phys. Lett. 102, 092601 (2013). [8] M. Ji et al., to be published. [9] X. J. Zhou et al., to be published.