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Nonreciprocal Wavefront Manipulation in Synthetically Moving Metagratings

by Younes Ra’di 1,* and Andrea Alù 1,2
Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY 10031, USA
Physics Program, Graduate Center, City University of New York, New York, NY 10016, USA
Author to whom correspondence should be addressed.
Photonics 2020, 7(2), 28;
Received: 29 February 2020 / Revised: 13 April 2020 / Accepted: 15 April 2020 / Published: 18 April 2020
We introduce a metasurface platform for nonreciprocal wave manipulation. We study metagratings composed of nonreciprocal bianisotropic particles supporting synthetic motion, which enable nonreciprocal energy transfer between tailored Floquet channels with unitary efficiency. Based on this framework, we derive the required electromagnetic polarizabilities to realize a metagrating supporting space wave circulation with unitary efficiency for free-space radiation and design a microwave metagrating supporting this functionality. The proposed concept opens new research venues to control free-space radiation with high efficiency beyond the limits dictated by Lorentz reciprocity. View Full-Text
Keywords: metagrating; metasurface; bianisotropy; nonreciprocity metagrating; metasurface; bianisotropy; nonreciprocity
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Ra’di, Y.; Alù, A. Nonreciprocal Wavefront Manipulation in Synthetically Moving Metagratings. Photonics 2020, 7, 28.

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