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Geometrical resonance conditions for THz radiation from the intrinsic Josephson junctions in Bi(2)Sr(2)CaCu(2)O(8+δ)
Manabu Tsujimoto1, Kazuhiro Yamaki, Kota Deguchi
1Institute of Materials Science, Graduate School of Pure & Applied Sciences, University of Tsukuba,1-1-1, Tennodai, Tsukuba, Ibaraki 305-8573, Japan.
Abstract:
Subterahertz radiation emitted from a variety of short rectangular-, square-, and disk-shaped mesas of intrinsic Josephson junctions fabricated from a Bi(2)Sr(2)CaCu(2)O(8+δ) single crystal was studied from the observed I-V characteristics, far-infrared spectra, and spatial radiation patterns. In all cases, the radiation frequency satisfies the conditions both for the ac Josephson effect and for a mesa cavity resonance mode. The integer higher harmonics observed in all spectra imply that the ac Josephson effect plays the dominant role in the novel dual-source radiation mechanism.
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