Abstract
In this chapter, we present two new studies investigating the behaviour of a tunnel junction operating near its superconducting gap, which can not be easily deduced from standard mixer theory. Firstly we used the current-voltage (IV) characteristic of an SIS mixer to study the localised heating effect of the tunnel junction by the tunnelling currents, and from this we were able to extract a fundamental physical property of the superconductor. Secondly, we studied the influence of the Josephson pair tunnelling on the sensitivity of an SIS mixer, where we observed that under certain circumstances, the pair tunnelling seems to improve the noise temperature performance of an SIS mixer.
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Tan, BK. (2016). The Characteristics of an SIS Junction Near Its Superconducting Gap. In: Development of Coherent Detector Technologies for Sub-Millimetre Wave Astronomy Observations. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-19363-2_8
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DOI: https://doi.org/10.1007/978-3-319-19363-2_8
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