Title :
Dynamic range of frequency-selective response of high-Tc Josephson detector to millimeter-wave radiation
Author :
Shirotov, Vadim ; Divin, Yuri ; Urban, Knut
Author_Institution :
Inst. of Solid-State Phys., Juelich Res. Center, Germany
fDate :
3/1/2001 12:00:00 AM
Abstract :
We have studied a voltage dependence of the response ΔI(V) of high-Tc Josephson detector to millimeter-wave radiation as a function of power of incident radiation. YBa2Cu3O7-x grain-boundary junctions with the resistances Rn=0.5-1.5 Ohm and the IcR n-product in the range 0.16-0.25 mV at 80 K have been fabricated for this study. Gunn oscillator with the frequency f=86 GHz and a set of calibrated attenuators with total attenuation of 80 dB have been used for the measurements. The dynamic range, i.e. the range of power of electromagnetic radiation at which the response of the detector is directly proportional to radiation power, was found to be around 40 dB above the noise-equivalent power for frequency-selective response at voltages V near hf/2e and >45 dB for the broadband response at low voltages
Keywords :
Josephson effect; barium compounds; grain boundaries; high-temperature superconductors; millimetre wave detectors; yttrium compounds; 80 K; 86 GHz; Gunn oscillator; Josephson detector; YBa2Cu3O7-x grain boundary junction; YBa2Cu3O7; attenuator; dynamic range; electromagnetic radiation power; frequency selective response; high-Tc superconductor; millimeter-wave radiation; noise equivalent power; voltage dependence; Attenuation measurement; Attenuators; Dynamic range; Electromagnetic measurements; Electromagnetic radiation; Frequency measurement; Gunn devices; Oscillators; Radiation detectors; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
