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Electromagnetic fields created by active circuits can be imaged by scanning an open-ended probe and imaging the linear or nonlinear power received. This microscope can be used to image the electric fields above a microwave circuit sample. One can also measure nonlinear signal generation standing waves, such as those arising from intermodulation in superconductors.

This work is supported by the National Science Foundation and the Maryland Center for Nanophysics and Advanced Materials.

Some relevant papers: (All papers can be downloaded from the full publication list)

62. Ashfaq S. Thanawalla, S. K. Dutta, C. P. Vlahacos, D. E. Steinhauer, B. J. Feenstra, Steven M. Anlage, and F. C. Wellstood, "Microwave Near-Field Imaging of Electric Fields in a Superconducting Microstrip Resonator," Appl. Phys. Lett. 73, 2491-2493 (1998) .

64. S. K. Dutta, C. P. Vlahacos, D. E. Steinhauer, Ashfaq S. Thanawalla, B. J. Feenstra, F. C. Wellstood, Steven M. Anlage, and Harvey S. Newman, "Imaging Microwave Electric Fields Using a Near-Field Scanning Microwave Microscope," Appl. Phys. Lett.74, 156-158 (1999).

68. Ashfaq S. Thanawalla, W. Hu, D. E. Steinhauer, S. K. Dutta, B. J. Feenstra, Steven M. Anlage, F. C. Wellstood, and Robert B. Hammond, "Frequency Following Imaging of the Electric Field around Resonant Superconducting Devices using a Near-Field Scanning Microwave Microscope," IEEE Trans. Appl. S upercond. 9, 3042-3045 (1999).

71. Wensheng Hu, B. J. Feenstra, A. S. Thanawalla, F. C. Wellstood, and Steven M. Anlage, "Imaging of Microwave Intermodulation Fields in a Superconducting Microstrip Resonator," Appl. Phys. Lett. 75, 2824-2826 (1999).