Far-Field Super-Resolution Imaging With Compact and Multifrequency Planar Resonant Lens Based on Time Reversal

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...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2015-12, Vol.63 (12), p.5586-5592
Main Authors: Gao, Qiang, Wang, Bing-Zhong, Wang, Xiao-Hua
Format: Article
Language:English
Subjects:
Electric fields
far-field
Imaging
Lenses
planar resonant lens
Signal resolution
Spatial resolution
super-resolution imaging
time-reversal
Wires
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Summary: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 information. Experiments are performed to validate the proposed method in laboratory environment at microwave band. Far-field super-resolution imaging results with resolutions of λ/20 and λ/10, respectively, are obtained, well beyond the diffraction limit. The compact size and multifrequency property of the proposed PRLs will make them easily be integrated to new super-resolution imaging systems.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2015.2496098