Anlage Research Group |
| High Frequency Superconductivity, Microscopy, Nanophysics, and Chaos |
Affiliations:
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. Below is an image of the intermodualtion distortion distribution inside a high-Tc superconducting resonator (see Ref. 71). These images give insight into the features that cause enhanced nonlinear response, for example.
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). pdf
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). pdf
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). pdf
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). pdf
Phone: (301) 405-7321 Fax: (301) 405-3779
Copyright © 2008-2012 University of Maryland
Contact us with comments, questions and feedback