Spatially resolved analyses of microwave and intermodulation current flow across HTS resonator using low temperature laser scanning microscopy

We have developed the LTLSM technique to search for intrinsic sources of microwave nonlinearities in large area complicated microwave circuits locally with micrometer spatial resolution. We have compared and analyzed the LTLSM images of J/sub RF/(x,y) and J/sub IM/(x,y) that were simultaneously obtained in the meander strip T12212/LAO superconducting resonator by this technique. It has been shown that the sources of microwave nonlinearities may not be uniformly distributed across the film, and that IM PR is localized near the peaks in J/sub RF/(x,y), with only a very small fraction of the structure contributing to the global IM.