Computer-generated space-variant polarization elements with subwavelength metal stripes.
Sub-diffraction-limited optical imaging with a silver superlens. Negative refraction makes a perfect lens. Controlling sound with acoustic metamaterials. (eds) Metamaterials: Physics and Engineering Explorations (Wiley-IEEE, 2006).Ĭummer, S. Optical Metamaterials: Fundamentals and Applications (Springer, 2009).Įngheta, N. Finally, we discuss promising trends, such as the use of dielectric rather than metallic unit elements and the use of planar gradient metamaterials in 3D systems.Ĭai, W. We also focus on the implementation of these materials in waveguide systems, which can enable electromagnetic cloaking, Fano resonances, asymmetric transmission and guided mode conversion. We discuss the use of planar gradient metamaterials for wave bending and focusing in free space, for supporting surface plasmon polaritons and for the realization of trapped rainbows.
In this Review, we summarize the progress made in the theoretical modelling of these materials, in their experimental implementation and in the design of functional devices. In particular, planar gradient metamaterials can be classified into three categories: gradient metasurfaces, gradient index metamaterials and gradient metallic gratings. Gradient metamaterials, which are characterized by a continuous spatial variation of their properties, provide a promising approach to the development of both bulk and planar optics. Metamaterials possess exotic properties that do not exist in nature.
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