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Quasioptical Terahertz Spectrometer Based on a Josephson Oscillator and a Cold Electron Nanobolometer

  • M. Tarasov
  • L. Kuzmin
  • E. Stepantsov
  • A. Kidiyarova-Shevchenko
Conference paper
Part of the NATO Science Series book series (NAII, volume 233)

Abstract

We have developed a low temperature transmission spectrometer operating in a wide range of frequencies from 100 GHz to 1.7 THz. The spectrometer has utilized the unique properties of high-Tc superconducting Josephson junctions and the wideband response of sensitive Cold-Electron Bolometers (CEB). The voltage response of the CEB integrated with log-periodic and double-dipole antennas, has been measured using an oscillator consisting of high-Tc Josephson junction integrated on a separate substrate with a log-periodic antenna. Superconducting Josephson junctions with high characteristic voltages (IcRn larger than 4 mV at 4.2 K) are fabricated by depositing YBa2Cu3O7-x on miscut sapphire bi-crystal substrates, where the tilting axis is along the grain boundary. The cold electron bolometer having a superconductor-insulator-normal metal-insulatorsuperconductor (SINIS) structure was 200 nm wide, 10 μm long, and terminating tunnel junctions were 200x300 nm2 area. The response of the bolometer with a double dipole antenna has resonance shape with maximum corresponding to the designed central frequency of 300 GHz. A voltage response of the bolometer up to 4·108 V/W corresponds to a noise equivalent power of the bolometer of 1.2·10-17 W/Hz1/2. Our measurements demonstrate that the Josephson junction is overheated by the transport current up to 3 K at 1 mV bias when it is placed on a millikelvin stage. A high-Tc Josephson junction operated at temperatures below 2 K has the advantage of a high IcRn product that enhances the oscillation frequency to above 2 THz.

Keywords

Josephson Junction Tunnel Junction Transition Edge Sensor Voltage Response Noise Equivalent Power 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 2006

Authors and Affiliations

  • M. Tarasov
    • 1
  • L. Kuzmin
    • 2
  • E. Stepantsov
    • 3
  • A. Kidiyarova-Shevchenko
    • 2
  1. 1.Institute of Radio Engineering and Electronics RASMoscowRussia
  2. 2.Chalmers University of TechnologyGöteborgSweden
  3. 3.Institute of Crystallography RASMoscowRussia

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