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Theory of Superconductive Traveling-Wave Photodetectors

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2 Author(s)
Ghamsari, B.G. ; Dept. of Electr. & Comput. Eng., Univ. of Waterloo, Waterloo, ON ; Majedi, A.Hamed

This paper studies the theory of traveling-wave photodetection in superconductive multilayer optical waveguides, as a general platform for ultrafast, ultrasensitive, and ultralow-noise optoelectronics. The kinetic inductance theory of superconductive thin films and the modified transmission line theory are employed to investigate the distributed photodetection and signal generation mechanisms in superconductive traveling-wave devices. A general model for calculation of the optical responsivity of superconductive traveling-wave photodetectors is developed and operation regimes of interest are highlighted. Moreover, the inclusion of a photoconductive layer in the device structure and some important loading schemes are discussed and their effects on the device performance, such as quantum efficiency and electrical bandwidth, are addressed.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:18 ,  Issue: 4 )

Date of Publication:

Dec. 2008

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