Josephson effects in an alternating current biased transition edge sensor

• Published in: Applied physics letters Vol. 105; no. 16
• Main Authors: Gottardi, L., Kozorezov, A., Akamatsu, H., van der Kuur, J., Bruijn, M. P., den Hartog, R. H., Hijmering, R., Khosropanah, P., Lambert, C., van der Linden, A. J., Ridder, M. L., Suzuki, T., Gao, J. R.
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 20-10-2014
• Subjects: Alternating current; Applied physics; Josephson effect; Nonlinear response; Sensors
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.4899065

We report the experimental evidence of the ac Josephson effect in a transition edge sensor (TES) operating in a frequency domain multiplexer and biased by ac voltage at MHz frequencies. The effect is observed by measuring the non-linear impedance of the sensor. The TES is treated as a weakly linked superconducting system and within the resistively shunted junction model framework. We provide a full theoretical explanation of the results by finding the analytic solution of the non-inertial Langevian equation of the system and calculating the non-linear response of the detector to a large ac bias current in the presence of noise.