TY - JOUR
T1 - Metagratings
T2 - Beyond the Limits of Graded Metasurfaces for Wave Front Control
AU - Ra'Di, Younes
AU - Sounas, Dimitrios L.
AU - Alù, Andrea
N1 - Publisher Copyright:
© 2017 American Physical Society.
PY - 2017/8/10
Y1 - 2017/8/10
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevLett.119.067404
DO - 10.1103/PhysRevLett.119.067404
M3 - Article
C2 - 28949646
AN - SCOPUS:85027832589
SN - 0031-9007
VL - 119
JO - Physical Review Letters
JF - Physical Review Letters
IS - 6
M1 - 067404
ER -