Optical photon detection in Al Superconducting Tunnel Junctions

Details Optical photon detection in Al Superconducting Tunnel Junctions Optical photon detection in Al Superconducting Tunnel Junctions

2004-07-13

arxiv.org/abs/cond-mat/0407318v1

presented at the 10th international conference on low temperature detectors, 7-11 July 2003, Genoa, Italy, 2003

Physics

Condensed Matter

Superconductivity

3 pages, 5 figures

Scientific paper

10.1016/j.nima.2003.11.300

We report on the successful fabrication of low leakage aluminium superconducting tunnel junctions with very homogeneous and transparent insulating barriers. The junctions were tested in an adiabatic demagnetisation refrigerator with a base temperature of 35 mK. The normal resistance of the junctions is equal to ~7 uohm cm2 with leakage currents in the bias voltage domain as low as 100 fA/um2. Optical single photon counting experiments show a very high responsivity with charge amplification factors in excess of 100. The total resolving power (including electronic noise) for 500 nm photons is equal to 13 compared to a theoretical tunnel limited value of 34. The current devices are found to be limited spectroscopically by spatial inhomogeneities in the detectors response

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