We describe the use of a miniature microwave Fiske cavity coupled to a Josephson junction oscillator to monitor the dynamic quasiparticle population created in the surrounding superconductor by incident x rays. An expression is obtained for the phase velocities of the TM modes supported by this structure. The design has the advantage of being inherently thick - sufficient to completely absorb low energy x rays and is potentially scalable to a pixilated device with a pixel size 50 μm in linear dimension. The device represents an alternative strategy to implement the dynamic microwave absorption approach suggested by Gulian and Van Vechten and subsequent variations.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)