PARITY-TIME SYMMETRIC METASURFACES AND METAMATERIALS
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United States of America Patent
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May 28, 2015
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Jun 17, 2014
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Abstract
A metamaterial device exploiting parity-time symmetry to achieve ideal loss compensation. The metamaterial device includes metamaterials and metasurfaces that are engineered to respect space-time inversion symmetry, i.e., that are invariant after taking their mirror image and running time backwards. One such metamaterial device utilizes two resonators with loss and gain that exactly compensate each other thereby causing the metamaterial device to be invisible when excited from one side of the metamaterial device and reflective when excited from the other side of the metamaterial device. Furthermore, a metamaterial device may include an object covered by a portion of a metasurface with loss and another portion of the metasurface with gain, where the loss and gain exactly compensate each other. The first portion of the metasurface absorbs all of an incident wave, whereas, the second portion of the metasurface re-emits the incident wave.
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