TY - GEN
T1 - Wavefront rerouting with super-grating metasurfaces
AU - Sounas, D. L.
AU - Radi, Y.
AU - Chalabi, H.
AU - Alu, A.
N1 - Publisher Copyright:
© 2017 IEEE.
PY - 2017/11/14
Y1 - 2017/11/14
N2 - Gradient metasurfaces have received significant attention in the past few years, due to their potential for advanced wave manipulation over a thin surface. Following the first, largely inefficient proposals to pattern the impinging wavefront by nanostructuring a plasmonic metasurface, to date there are several elegant approaches to design metasurfaces that can imprint a pattern of choice to the impinging wavefront with large resolution. These approaches typically consist of discrete implementations of the continuous surface impedance profile ideally required to convert a certain wavefront into the desired one, and they all appear to provide a trade-off between efficiency and complexity. Here, on the contrary, we introduce the concept of super-grating metasurfaces, based on which one can arbitrarily steer an impinging beam with unitary efficiency by relying on specifically tailored asymmetric resonances within each unit cell of a suitably designed periodic grating. Our theory shows that broadband anomalous reflection and transmission does not necessarily require the use of continuous spatial gradients of surface impedance, but they can be achieved by suitably designed periodic arrays of resonant particles with specifically tailored asymmetric responses. In addition to their theoretical importance, these results can be important for the design of efficient metasurfaces based on simple and realizable principles.
AB - Gradient metasurfaces have received significant attention in the past few years, due to their potential for advanced wave manipulation over a thin surface. Following the first, largely inefficient proposals to pattern the impinging wavefront by nanostructuring a plasmonic metasurface, to date there are several elegant approaches to design metasurfaces that can imprint a pattern of choice to the impinging wavefront with large resolution. These approaches typically consist of discrete implementations of the continuous surface impedance profile ideally required to convert a certain wavefront into the desired one, and they all appear to provide a trade-off between efficiency and complexity. Here, on the contrary, we introduce the concept of super-grating metasurfaces, based on which one can arbitrarily steer an impinging beam with unitary efficiency by relying on specifically tailored asymmetric resonances within each unit cell of a suitably designed periodic grating. Our theory shows that broadband anomalous reflection and transmission does not necessarily require the use of continuous spatial gradients of surface impedance, but they can be achieved by suitably designed periodic arrays of resonant particles with specifically tailored asymmetric responses. In addition to their theoretical importance, these results can be important for the design of efficient metasurfaces based on simple and realizable principles.
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U2 - 10.1109/MetaMaterials.2017.8107870
DO - 10.1109/MetaMaterials.2017.8107870
M3 - Conference contribution
AN - SCOPUS:85040520231
T3 - 2017 11th International Congress on Engineered Material Platforms for Novel Wave Phenomena, Metamaterials 2017
SP - 13
EP - 15
BT - 2017 11th International Congress on Engineered Material Platforms for Novel Wave Phenomena, Metamaterials 2017
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 11th International Congress on Engineered Material Platforms for Novel Wave Phenomena, Metamaterials 2017
Y2 - 28 August 2017 through 2 September 2017
ER -