THz mixing properties of YBa2Cu3O7-δ grain boundary Josephson junctions on bicrystal substrates

J. Chen, H. Myoren, K. Nakajima, T. Yamashita

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7 Citations (Scopus)


Using high-Tc grain boundary Josephson junctions (GBJJs) made of YBa2Cu3O7-δ (YBCO) deposited across MgO bicrystal boundary, at TeraHertz (THz) waveband we successfully demonstrated both fundamental and harmonic frequency mixing. Radiation from a far-infrared (FIR) laser was coupled to the junction, which was integrated with a planar bow-tie antenna, via an extended hyperhemispherical silicon lens. Fundamental mixing manifested itself in the junction's DC current-voltage (I-V) curve as a third Shapiro step in addition to those two induced by the THz laser lines from a slightly misaligned resonator. In harmonic mixing between a THz laser line and a microwave local oscillator, the highest harmonic number we could get was 490 with a signal-to-noise-ratio of 9 dB at the intermediate frequency (IF). The IF output (PIF) depended strongly on the bias voltage, the local oscillator power level, the harmonic number (N), etc.

Original languageEnglish
Pages (from-to)288-291
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue number1-4
Publication statusPublished - 1997 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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