Recent advances in planar optics: from plasmonic to dielectric metasurfaces
This article reviews recent progress leading to the realization of planar optical components made of a single layer of
phase shifting nanostructures. After introducing the principles of planar optics and discussing earlier works on sub-
wavelength diffractive optics, we introduce a classification of metasurfaces based on their different phase mechanisms
and profiles and a comparison between plasmonic and dielectric metasurfaces. We place particular emphasis on the
recent developments on electric and magnetic field control of light with dielectric nanostructures and highlight the
physical mechanisms and designs required for efficient all-dielectric metasurfaces. Practical devices of general interest
such as metalenses, beam deflectors, holograms, and polarizing interfaces are discussed, including high-performance
metalenses at visible wavelengths. Successful strategies to achieve achromatic response at selected wavelengths and near
unity transmission/reflection efficiency are discussed. Dielectric metasurfaces and dispersion management at interfaces
open up technology opportunities for applications including wavefront control, lightweight imaging systems, displays,
electronic consumer products, and conformable and wearable optics. © 2017 Optical Society of America
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