Terahertz-wave radiation emitted by intrinsic Josephson junctions

Radiation properties of terahertz (THz) electromagnetic waves emitted from stacks of 3 and 50 intrinsic Josephson junctions by flowing bias currents have been numerically investigated for high-frequency device applications. A novel multibranch structure in the resistive state was obtained for the cu...

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Veröffentlicht in:Journal of applied physics 2010-05, Vol.107 (10), p.103920-103920-6
Hauptverfasser: Tachiki, Takashi, Uchida, Takashi
Format: Artikel
Sprache:eng
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Zusammenfassung:Radiation properties of terahertz (THz) electromagnetic waves emitted from stacks of 3 and 50 intrinsic Josephson junctions by flowing bias currents have been numerically investigated for high-frequency device applications. A novel multibranch structure in the resistive state was obtained for the current-voltage characteristics of the stacks. Each branch corresponded to an individual mode of a two-dimensional cavity resonance for Josephson plasma waves in the directions parallel and perpendicular to the c -axis of the stack. The electromagnetic field distribution in the stack exhibited standing-wave patterns not only for the in-phase mode between junctions but also for the other modes in different branches. Maximum radiation power was attained for the in-phase mode, and the corresponding bias point was measured for the 3- and 50-junction stacks. The peak power in the 50-junction stack was approximately 50 times larger than that in the 3-junction stack. The frequency spectra at maximum power exhibited a sharp main peak and a few harmonics. These properties are useful in designing a THz oscillator using intrinsic Josephson junctions.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3393037