Continuous 30 μW terahertz source by a high-Tc superconductor mesa structure | Zendy

S. Sekimoto | Zendy; Chiho Watanabe | Zendy; Hidetoshi Minami | Zendy; Takashi Yamamoto | Zendy; Takanari Kashiwagi | Zendy; Richard A. Klemm | Zendy; Kazuo Kadowaki | Zendy

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Continuous 30 μW terahertz source by a high-Tc superconductor mesa structure

Author(s) -

S. Sekimoto,

Chiho Watanabe,

Hidetoshi Minami,

Takashi Yamamoto,

Takanari Kashiwagi,

Richard A. Klemm,

Kazuo Kadowaki

Publication year - 2013

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4827094

Subject(s) - terahertz radiation , josephson effect , superconductivity , optoelectronics , common emitter , monochromatic color , materials science , high temperature superconductivity , condensed matter physics , mesa , radiation , physics , optics , computer science , programming language

Using a modified mesa structure of high-Tc superconducting Bi2Sr2CaCu2O8+δ with a thin underlaying base superconductor (∼3 μm), the effective working temperature of the continuous and monochromatic terahertz emitter is extended up to 70 K, and the maximum power of ∼30 μW at 0.44 THz is achieved at the relatively high temperature of T b = 55 K in a low bias current retrapping region. The diverging behavior of the intensity occurring at 55 K in the low current regime without hot spot formation may provide us an important clue for the stronger THz radiation from intrinsic Josephson junction devices

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