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21 September 2015 Exploiting reciprocity for imaging
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Abstract
High resolution images have been obtained by “coding” evanescent waves from high spatial frequencies into propagating waves using a random medium. Time reversal of the scattered wave propagated back into the same random medium recovers the image. We investigate the scattering properties of a (remote) reciprocal scattering medium to accomplish the same image recovery but without the need for wave detection and followed by time reversal. We present examples of such (metamaterial) scattering media and their reciprocal structures and suggest how they might best be used for remote high resolution imaging. A metamaterial structure offers the possibility of low reflection losses with an index, |n| ~ 1.
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M. Karami and M. A. Fiddy "Exploiting reciprocity for imaging", Proc. SPIE 9600, Image Reconstruction from Incomplete Data VIII, 96000B (21 September 2015); https://doi.org/10.1117/12.2188875
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