A prototype of SQUID read-out for current measurements at the output of a normal metal hot-electron microbolometer has been developed and tested. The system is based on serial VTT dc SQUID and input μ-metal core solenoid transformer. The achieved current resolution is 300 fA/Hz1/2. Johnson noise of metal resistor and shot noise of tunnel junction were used for current calibration of SQUID read-out. The current noise spectra of 35 k SIN tunnel junction measured at different bias voltages are presented.
- dc SQUID
- SIN tunnel junction
- SQUID femtoamperemeter
Tarasov, M., Gudoshnikov, S., Kalabukhov, A., Seppä, H., Kiviranta, M., & Kuzmin, L. (2002). Towards a dc SQUID read-out for the normal metal hot-electron microbolometer. Physica C: Superconductivity and its Applications, 368(1-4), 161-165. https://doi.org/10.1016/S0921-4534(01)01159-5