著者

Asai Hidehiro Tachiki Masashi Kadowaki Kazuo

出版者

Elsevier

雑誌

Physica. C, Superconductivity and its applications (ISSN:09214534)

巻号頁・発行日

vol.491, pp.35-39, 2013-08

被引用文献数

2 1

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In this study, we investigate numerically the terahertz radiation from the mesa-structured intrinsic Josephson junctions (IJJs). The Sine–Gordon equation for inside of the mesa, and the Maxwell equation for outside of the mesa, are solved simultaneously. We consider the influence of a hot spot in the mesa where jc locally decreases, and calculate the radiation power as a function of the voltage. We observe strong radiation when the ac Josephson frequency satisfies the cavity resonance condition. For this strong radiation from the IJJs mesa, we calculate the radiation patterns. The radiation patterns reflect the existence of two types of internal modes: a uniform background mode and a cavity resonance mode. Furthermore, the radiation patterns are strongly affected by the diffraction at substrate edges.

著者

Klemm Richard A. Delfanazari Kaveh Tsujimoto Manabu Kashiwagi Takanari Kitamura Takeo Yamamoto Takashi Sawamura Masashi Ishida Kazuya Hattori Toshiaki Kadowaki Kazuo

出版者

Elsevier

雑誌

Physica. C, Superconductivity and its applications (ISSN:09214534)

巻号頁・発行日

vol.491, pp.30-34, 2013-08

被引用文献数

19 3

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In order to understand the radiation observed from the intrinsic Josephson junctions in triangular Bi2Sr2CaCu2O8+δ mesas, we calculate the transverse magnetic (TM) electromagnetic modes for thin equilateral cavities. A new set of distinct but degenerate TM modes coexists with the known modes of Helszajn and James, but are expected to lead to distinct radiation angular distribution patterns. Although we have been unable to solve for the exact TM modes of a thin cavity of general acute isosceles triangular shape, we solved exactly the closely related problems of the TM cavity modes of two thin circumscribing “pie-shaped” wedges, which provide highly accurate approximations to very acute isosceles triangular cavities.