Terahertz Spectral Analysis by Frequency-Selective Incoherent Detection in High-T(c) Josephson Junctions
RUSSIAN ACADEMY OF SCIENCES MOSCOW INST OF RADIO ENGINEERING AND ELECTRONICS
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The detector response of YBa2Cu3O7-x Josephson grain-boundary junctions to monochromatic radiation with the frequency in the range from 60 GHz to 5 THz has been studied. Odd-symmetric resonances near the voltages Vhf2e in the responses delta I V of these junctions to radiation with different frequencies f have been observed in a decade of spectral range for any operating temperature between 30 to 85 K. The spectral range of this selective detection has scaled with the I sub c R sub n-product of the Josephson junction, so decreasing the junction temperature from 85 to 30 K one can perform the spectral analysis in two decades. A prototype of terahertz Hilbert-transform spectrum analyzer based on high-Tc Josephson junction integrated into a Stirling cooler has been developed. A resolving power of around 10 exp -3 has been demonstrated in the spectral analysis of output radiation from optically-pumped far-infrared CH3OH laser.
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