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Physica C Superconductivity

High linearity Josephson-junction array structures

Victor K. Kornev, Igor I. Soloviev, N. V. Klenov, Oleg A. Mukhanov

Published Mar 13, 2008• 7 citations
Publisher
DOI
10.1016/j.physc.2007.11.077

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The possibilities and physical mechanisms of detection of microwave X- and Ka-band radiation by high-temperature superconducting (HTS) YBa2Cu3O7-0.05 (YBCO) bicrystalline Josephson junctions (JJ) embedded in a surface wave resonator (SWR) are considered. Microwave detection was investigated experimentally by using a linear Josephson junction array (JJA) embedded in the SWR. Measurements were carried out starting from the critical temperature of HTS film (T = 92 K), down to the liquid nitrogen level (T = 77 K) and beyond (down to 20 K) using the Gifford-McMahon closed-cycle cryo-cooler. The sensitivity of such type of detectors was determined to be approximately 104 V/W. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Millimeterwave detectors have been made of a series-connected array of Josephson junctions. Each junction of the array responds in phase to radiation and therefore the series-connected array as a whole behaves as if it were a single Josephson junction. When the Josephson junctions have a high critical current density, the IF outputs have sharp peaks at the voltages V = 2NΔ/ne where N is the number of the Josephson junctions in series connection and n is an integer. The subharmonic energy gap structures in voltage-current curves of Josephson junctions come from the Andreev-reflection-assisted-tunneling according to the recent Arnold theories.
Abstract Several studies have been performed on fabrication of Josephson junction arrays to improve the voltage sensitivity and impedance matching of Josephson junctions to be used as high‐speed and high‐sensitivity detectors of microwaves and submillimeter‐waves. This paper proposes a method for arranging point‐contact Josephson junctions in a net structure and describes experimental results of detection. First, we measured the I‐V characteristic at super low temperature and found that the critical current can be adjusted from a few μA to a few mA by varying the contact pressure. Next, we obtained the equivalent circuit of this net‐structure array installed in an x‐band waveguide in such a way that the array is perpendicular to the wave traveling direction. The net‐structure array was treated as a uniform surface impedance and the series admittance due to the gap between the array and the waveguide wall was obtained by an extension of the analysis for a capacitive window. To compare the equivalent circuit parameters with measured values, we carried out an impedance measurement at room temperature. The results agreed well with theoretical values. Further, a preliminary experiment for a wideband detection was performed in the superconducting state and obtained detection voltages for 10‐GHz signals as well as HCN laser light of wavelength 337 μm.