Title :
Terahertz spectral analysis by ac Josephson effect in high-Tc bicrystal junctions
Author :
Divin, Yuri ; Volkov, Oleg ; Pavlovskii, Valery ; Poppe, Ulrich ; Urban, Knut
Author_Institution :
Inst. of Solid-State Phys., Juelich Res. Center, Germany
fDate :
3/1/2001 12:00:00 AM
Abstract :
A prototype of a terahertz Hilbert-transform spectrum analyzer based on a high-Tc Josephson junction integrated into a Stirling cooler has been developed. The detector response of YBa2 Cu3O7-x Josephson grain-boundary junctions to monochromatic radiation with the frequency f in the range from 60 GHz to 5 THz has been studied. Odd-symmetric resonances near the voltages V=hf/2e in the responses ΔI(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. Decreasing the junction temperature from 85 to 30 K by a Stirling cooler, the spectral analysis could be made in two decades of spectral range. A resolving power δf/f~10-3 has been shown in the terahertz spectral analysis with the low-resistive Josephson junctions. As an example of application of this analyzer, an optimization of the single-line operation of a far-infrared optically-pumped CH3OH laser has been demonstrated
Keywords :
Hilbert transforms; Josephson effect; barium compounds; bicrystals; grain boundaries; high-temperature superconductors; spectral analysis; submillimetre wave spectra; yttrium compounds; 30 to 85 K; 60 GHz to 5 THz; AC Josephson effect; Hilbert transform; Stirling cooler; YBa2Cu3O7; bicrystal junction; grain boundary Josephson junction; high-Tc superconductor; methanol far infrared laser; spectral analysis; terahertz radiation; Electromagnetic radiation; Frequency; Josephson effect; Josephson junctions; Physics; Radiation detectors; Solid state circuits; Spectral analysis; Telephony; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
