Wave-front Transformation with Gradient Metasurfaces
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Open Access
- 14 October 2016
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review X
- Vol. 6 (4), 041008
- https://doi.org/10.1103/physrevx.6.041008
Abstract
Relying on abrupt phase discontinuities, metasurfaces characterized by a transversely inhomogeneous surface impedance profile have been recently explored as an ultrathin platform to generate arbitrary wave fronts over subwavelength thicknesses. Here, we outline fundamental limitations of passive gradient metasurfaces in molding the impinging wave and show that local phase compensation is essentially insufficient to realize arbitrary wave manipulation, but full-wave designs should be considered. These findings represent a critical step towards realistic and highly efficient conformal wave manipulation beyond the scope of ray optics, enabling unprecedented nanoscale light molding.Keywords
Funding Information
- Welch Foundation (F-1802)
- Air Force Office of Scientific Research (FA9550-13-1-0204)
- National Science Foundation
- Simons Foundation
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