Time reversal far-field super-resolution electromagnetic imaging aided by the near-field sub-wavelength structures

Abstract

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, how to receive the information of these waves in the far-field is a key to realize the super-resolution imaging.