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Published on: June 7, 2019
Metagratings: Beyond the Limits of Graded Metasurfaces for Wave Front Control
Younes Ra'di1, Dimitrios L Sounas1, Andrea Alù1
1Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, USA.
Abstract:
Graded metasurfaces exploit the local momentum imparted by an impedance gradient to mold the impinging wave front. This approach suffers from fundamental limits on the overall conversion efficiency, and it is challenged by fabrication limitations on the spatial resolution. Here, we introduce the concept of metagratings, formed by periodic arrays of carefully tailored bianisotropic inclusions and show that they enable wave front engineering with unitary efficiency and significantly lower fabrication demands. We employ this concept to design reflective metasurfaces for wave front steering without limitations on efficiency. A similar approach can be extended to transmitted beams and arbitrary wave front transformation, opening opportunities for highly efficient metasurfaces for extreme wave manipulation.
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