Improved excitation mode selectivity of high- T<sub>c</sub>superconducting terahertz emitters

Journal article (2018)

Authors

Takanari Kashiwagi University of Tsukuba
Takumi Yuasa University of Tsukuba
Hidetoshi Minami University of Tsukuba
T. Yamamoto Quantum Internet Division
Richard A. Klemm University of Central Florida
Kazuo Kadowaki University of Tsukuba
Yuki Tanabe University of Tsukuba
Takayuki Imai University of Tsukuba
Genki Kuwano University of Tsukuba
Ryusei Ota University of Tsukuba
Kento Nakamura University of Tsukuba
Yukino Ono University of Tsukuba
Youta Kaneko University of Tsukuba
Manabu Tsujimoto University of Tsukuba
Department
Quantum Internet Division
Copyright: © 2018 Takanari Kashiwagi, Takumi Yuasa, Yuki Tanabe, Takayuki Imai, Genki Kuwano, Ryusei Ota, Kento Nakamura, Yukino Ono, Youta Kaneko, Manabu Tsujimoto, Hidetoshi Minami, T. Yamamoto, Richard A. Klemm, Kazuo Kadowaki
DOI
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https://doi.org/10.1063/1.5033914
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Published Date

21-07-2018

Language

English

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Department

Quantum Internet Division

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.

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