Characterization of cavity mode and radiation pattern in superconducting coherent terahertz emitters

POSTER

Abstract

We discuss the broadly tunable terahertz (THz) radiation in solid state terahertz (THz) emitters based on high-temperature superconducting Bi2Sr2CaCu2O8+δ (Bi-2212). We experimentally measure the current-voltage characteristics (IVC) of mesas of different geometries, such as triangular-, pentagonal-, hexagonal-, and elliptical- cavities, and compare the IVC of the radiating and no-radiating cavities. The THz emission spectra in radiating THz cavities was measured using the Fourier transform infrared spectrometer in order to elucidate the radiation mechanism of the emitters. Moreover, we experimentally and theoretically study the angular dependence of the emission intensity obtained in mesas’ plane at various frequencies and detection angles, by rotating the sample holder relative to the detector, to identify the excited EM cavity modes within the cavities that participate in the emitter output power enhancement.
Reference:
[1] DP Cerkoney et al., J. Phys. Condens. Matter 29, 015601 (2016),
[2] K. Delfanazari et al, J. Infrared Millim. Terahertz Waves 35, 131-146 (2014),
[3] K. Delfanazari et al., IEEE Trans. Terahertz Sci. Technol. 5, 505-511 (2015),
[4] K. Delfanazari et al., Opt. Express 21, 2171-2184 (2013),

Presenters

  • Kaveh Delfanazari

    • University of Cambridge

Authors

  • Kaveh Delfanazari

    • University of Cambridge

  • Richard Klemm

    • University of Central Florida
    • physics, University of Central Florida

  • Manabu Tsujimoto

    • University of Tsukuba

  • Daniel Cerkoney

    • Rutgers University

  • Takashi Yamamoto

    • Delft University of Technology
    • QuTech Delft University of Technology

  • Takanari Kashiwagi

    • University of Tsukuba

  • Kazuo Kadowaki

    • University of Tsukuba
    • Institute for Materials Science, University of Tsukuba