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Proceedings Paper

Theoretical exploration of Josephson plasma emission in intrinsic Josephson junctions
Author(s): Masashi Tachiki; Masahiko Machida
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Paper Abstract

In this paper, we theoretically predict the best efficient way for electromagnetic wave emission by Josephson plasma excitation in intrinsic Josephson junctions. First, we briefly derive basic equations describing dynamics of phase differences inside junction sites in intrinsic Josephson junctions, and review the nature of Josephson plasma excitation modes based on the equations. Especially, we make an attention to that Josephson plasma modes have much different dispersion relations depending on the propagating directions and their different modes can be recognized as N standing waves propagating along ab-plane in cases of finite stacked systems composed of N junctions. Second, we consider how to excite their modes and point out that excitations of in-phase mode with the highest propagation velocity among their N modes are the most efficient way for electromagnetic wave emissions. Finally, we clarify that in-phase excitations over all junctions are possible by using Josephson vortex flow states. We show simulation results of Josephson vortex flow states resonating with some Josephson plasma modes and predict that super-radiance of electromagnetic field may occur in rectangular vortex flow state in which spatio- temporal oscillations of electromagnetic fields are perfectly in- phase.

Paper Details

Date Published: 6 September 2000
PDF: 13 pages
Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); doi: 10.1117/12.397837
Show Author Affiliations
Masashi Tachiki, National Research Institute for Metals (Japan) and CREST/Japan Science and Technology Corp (Japan)
Masahiko Machida, Argonne National Lab. (United States)
Japan Atomic Energy Research Institute (Japan)
CREST/Japan Atomic Energy Research Institute (Japan)

Published in SPIE Proceedings Vol. 4058:
Superconducting and Related Oxides: Physics and Nanoengineering IV
Davor Pavuna; Ivan Bozovic, Editor(s)

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