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Dynamic range of frequency-selective response of high-Tc Josephson detector to millimeter-wave radiation

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3 Author(s)
Shirotov, V. ; Inst. of Solid-State Phys., Juelich Res. Center, Germany ; Divin, Y. ; Urban, K.

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

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Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )