On the development of superconducting tunnel junctions as photon counting spectrometers for application in astrophysics

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Superconducting Tunnel Junctions, Spectral Resolution, Astrophysics

Scientific paper

The current state of development of superconducting tunnel junctions as photon counting spectroscopic detectors is reviewed and their application to a broad range of astrophysical problems discussed. Arrays of tantalum based junctions have now reached a state of maturity such that serious astronomical applications can be considered over the wavelength range from 0.5 nm to 2 μm. The agreement between the theoretical resolution, as defined by the tunnel limited resolution, and measurements over this waveband, for both niobium and tantalum based devices, provides a good indication that lower critical temperature elemental superconductors may provide an even improved resolution in the near future. Such devices based on hafnium with a critical temperature of ~130 mK are already under development.

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