Cavity mode waves during terahertz radiation from rectangular Bi2Sr2CaCu2O8+delta mesas

    Authors

    R. A. Klemm; E. R. LaBerge; D. R. Morley; T. Kashiwagi; M. Tsujimoto;K. Kadowaki

    Comments

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    Abbreviated Journal Title

    J. Phys.-Condes. Matter

    Keywords

    ELECTROMAGNETIC-WAVES; JOSEPHSON-JUNCTIONS; Physics, Condensed Matter

    Abstract

    We re-examined the angular dependence of the radiation from the intrinsic Josephson junctions in rectangular mesas of Bi2Sr2CaCu2O8+delta, in order to determine if the cavity mode part of the radiation arises from waves across the width w or along the length l of the mesas, associated with 'hot spots' (Wang et al 2010 Phys. Rev. Lett. 105 057002). We derived analytical forms for the angular dependence expected in both cases for a general cavity mode in which the width of the mesa corresponds to an integer multiple of one-half the wavelength of the radiation. Assuming the coherent radiation from the ac Josephson current source and the cavity magnetic surface current density source combine incoherently, fits to the data of Kadowaki et al (2010 J. Phys. Soc. Japan 79 023703) on a mesa with mean l/w = 5.17 for both wave directions using two models for the incoherent combination were made, which correspond to standing and traveling waves, respectively. The results suggest that the combined output from the uniform ac Josephson current source plus a cavity wave forming along the rectangle length is equally probable as that of the combined output from the uniform ac Josephson current plus a cavity wave across the width. However, for mesas in which nl/2w is integral, where n is the index of the rectangular TMn,0z mode, it is shown that standing cavity mode waves along the length of the mesa do not radiate in the xz plane perpendicular to the length of the mesa, suggesting experiments on such mesas could help to resolve the question.

    Journal Title

    Journal of Physics-Condensed Matter

    Volume

    23

    Issue/Number

    2

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    11

    WOS Identifier

    WOS:000286004500008

    ISSN

    0953-8984

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