Mixing at terahertz frequency band using YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} bicrystal Josephson junctions

Journal Article · Fri Aug 01 04:00:00 EDT 1997 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.119836· OSTI ID:527956

Chen, J; Myoren, H; Nakajima, K; Yamashita, T ^[1]; Wu, P H ^[2]

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1. Research Institute of Electrical Communication, Tohoku University, Sendai 980-77 (Japan)
2. Department of Electronic Science and Engineering, University of Nanjing, Nanjing 210093 (China)

Using high-Tc Josephson junctions made of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} deposited across MgO bicrystal boundary, at terahertz (THz) frequency band, we demonstrated both fundamental and harmonic mixing. Radiation from a far-infrared 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{close_quote}s dc current{endash}voltage (I{endash}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. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 527956
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 5 Vol. 71; ISSN 0003-6951; ISSN APPLAB
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM COMPOUNDS
BARIUM OXIDES
BICRYSTALS
COPPER OXIDES
FREQUENCY MIXING
HARMONICS
HIGH-TC SUPERCONDUCTORS
JOSEPHSON JUNCTIONS
MICROWAVE RADIATION
SIGNAL-TO-NOISE RATIO
YTTRIUM COMPOUNDS
YTTRIUM OXIDES