Imaging of microwave fields is made possible by measuring of spin changes in individual atoms or electrons. (Fig. University of Basel, Department of Physics)
Microwave field imaging is becoming increasingly important, as microwaves play an essential role in modern technology and can also be used in medical diagnostics. Researchers from the Swiss Nanoscience Institute and the Department of Physics at the University of Basel have now independently developed two new methods for imaging microwave fields. Both methods exploit the change in spin states induced by an applied microwave field, as reported by the researchers in the "New Journal of Physics". Microwaves not only serve to heat meals quickly, but are also indispensable for wireless communication in laptops and cellphones, in which microwave circuits are used to transmit and decode information. A newly emerging field of use in medical diagnostics stems from the fact that cancer cells, for example, absorb microwaves differently from the way healthy tissue does. In order to further promote the use of electromagnetic microwave fields in the basic sciences, communication technology, and diagnostics, it is important to be able to analyze them precisely. Until now, however, there have been almost no quick and easy methods to obtain accurate images of microwave fields.
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