Microwave response measurement and modeling of high-temperature superconducting thin-film detectors

Barry E. Grabow; Bradley G. Boone

doi:10.1117/12.176141

Abstract

We report here a model of a high temperature superconducting detector response to microwaves. The goal of the model is to approximate, based on microscopic theoretical results, the measured response of a superconducting detector to microwave frequency over a wide temperature range (from zero up to the critical temperature of the superconductor, T_c). In this work, the nonbolometric response is emphasized because its detector performance is better than the bolometric response. The nonbolometric response model is based on microwave enhancement of a thermal fluctuation voltage occurring in the networks of inherent Josephson junctions. Modeling the film as a distribution of granular connections with varying critical currents and temperatures yields results similar to those observed in microwave response measurements in granular Bi-Sr-Ca-Cu-O thin films. We also report here initial measurements and modeling of the microwave (9 GHz) response of a bi-epitaxial thin film showing the simultaneous presence of bolometric and nonbolometric response peaks in the same sample. The response in this Y-Ba-Cu-O thin films gives further evidence of microwave detection in the networks of inherent Josephson junctions presented at the grain boundaries of two epitaxial layers.

Citation Download Citation

Barry E. Grabow and Bradley G. Boone "Microwave response measurement and modeling of high-temperature superconducting thin-film detectors", Proc. SPIE 2159, High-Temperature Superconducting Detectors: Bolometric and Nonbolometric, (20 May 1994); doi: 10.1117/12.176141; https://doi.org/10.1117/12.176141

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