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Optical photon detection in Al Superconducting Tunnel Junctions

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arxiv cond-mat/0407318 v1 pith:MA6A7P5Z submitted 2004-07-13 cond-mat.supr-con

G. Brammertz , A. Peacock , P. Verhoeve , D. Martin , R. Venn This is my paper · ORCID
classification cond-mat.supr-con
keywords junctionstunnelequalleakagelimitedopticalphotonsuperconducting
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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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