Terahertz Oscillating Devices Based Upon the Intrinsic Josephson Junctions in a High Temperature Superconductor

    Authors

    K. Delfanazari; H. Asai; M. Tsujimoto; T. Kashiwagi; T. Kitamura; K. Ishida; C. Watanabe; S. Sekimoto; T. Yamamoto; H. Minami; M. Tachiki; R. A. Klemm; T. Hattori;K. Kadowaki

    Comments

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    Abbreviated Journal Title

    J. Infrared Millim. Terahertz Waves

    Keywords

    Superconductor; Intrinsic Josephson junctions; Ac-Josephson effect; Terahertz wave; Cavity resonance; SINGLE-CRYSTALLINE BI2SR2CACU2O8+DELTA; ANGULAR-DEPENDENCE; WAVE; EMISSION; RADIATION; MESAS; COHERENT; POWER; FLOW; Engineering, Electrical & Electronic; Optics; Physics, Applied

    Abstract

    Recent developments of coherent terahertz (THz) oscillators based on the intrinsic Josephson junctions (IJJs) in mesas of the high temperature superconductor Bi2Sr2CaCu2O8+delta are reviewed. Experimental and theoretical studies of the emission from equilateral, right-angled isosceles, and acute isosceles triangular mesas are compared with those obtained from rectangular, square, and disk mesas, in order to determine the role of the mesa geometry. The superconducting properties and emission frequency f spectra are presented for a variety of triangular mesa geometries. Analytic and finite difference time domain numerical calculations of the emissions from the internal electromagnetic (EM) cavity modes of triangular mesas are compared with experiment. The experimental f always satisfies the ac Josephson relation, and its narrow linewidth arises from the synchronized emissions from many IJJs. For some mesa geometries, f also strongly locks onto an EM cavity mode frequency, enhancing the emission's stability and output power. For other geometries, such cavity mode locking is weak, and f is highly tunable.

    Journal Title

    Journal of Infrared Millimeter and Terahertz Waves

    Volume

    35

    Issue/Number

    1

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    131

    Last Page

    146

    WOS Identifier

    WOS:000330956000014

    ISSN

    1866-6892

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