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Published Online: 16 July 2018
Accepted: June 2018

Improved excitation mode selectivity of high- T c superconducting terahertz emitters

Journal of Applied Physics 124, 033901 (2018); https://doi.org/10.1063/1.5033914
Takanari Kashiwagi1,2, Takumi Yuasa1, Yuki Tanabe1, Takayuki Imai1, Genki Kuwano1, Ryusei Ota1, Kento Nakamura1, Yukino Ono1, Youta Kaneko1, Manabu Tsujimoto1,2, Hidetoshi Minami1,2, Takashi Yamamoto3, Richard A. Klemm4, and Kazuo Kadowaki1,2,5
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ABSTRACT
Using our recent design of thermally managed sandwich device structures, we studied the radiation frequency characteristics of three such devices of the same rectangular dimensions made from the same single crystal of the high-Tc superconductor Bi2Sr2CaCu2O8+δ, and all three devices exhibit similar characteristics. Their observed radiation intensities appear to be enhanced at many transverse magnetic TMn,m cavity mode frequencies, possibly including some higher TM0,m modes with waves solely along the rectangular length, none of which have previously been reported. In addition, the temperature dependences of the radiation frequencies correspond strongly to the temperature dependences of the maximum bias voltages applied to the devices. The excitations of many cavity modes higher in frequency than that of the usually observed TM1,0 mode and the high reproducibility of the radiation frequency characteristics both appear to originate from the reduction in the Joule self-heating of the thermally managed sandwich structures. The information provided here should aid in the design of future devices to obtain the desired emission frequency ranges.

ACKNOWLEDGMENTS

This work was supported by JSPS KAKENHI Grant No.JP15H01996. T.K. was also supported by JSPS KAKENHI Grant No. JP17K05018.

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