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The resolution of traditional far-field imaging systems is restricted by the diffraction limit, because only the propagation waves, emitted by the source or scattered by the object, can be received by the devices of imaging systems. As we know, evanescent waves carry sub-wavelength information. But they cannot propagate to the far-field and exhibit exponential attenuation in the space. Therefore,...
Time reversal (TR) of electromagnetic waves exhibits temporal and spatial focusing. With the assistance of near-field sub-wavelength structures, TR electromagnetic waves can show spatial super-resolution focusing both in the near- and far-fields. Based on this characteristic, TR technique has found potential applications in super-resolution imaging. This invited talk simply gives an overview on far-field...
Planar resonant lenses (PRLs) consisting of periodically distributed strip resonators with different lengths are proposed for far-field super-resolution electromagnetic imaging. With the help of PRLs, evanescent waves can be converted into propagation waves. So, based on time-reversal (TR) technique, time-reversal mirror in the far-field can receive the electromagnetic signals carrying the subwavelength...
We demonstrate a linear polarization difference imaging technique which is insensitive to both sample orientation and polarization angle. Various tests show its potential applications in medical diagnosis.
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