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陈焕阳和徐亚东应邀为Nature Reviews Materials撰写综述性论文

日期: 2016-10-17     阅读次数:726

标题:Planar gradient metamaterials
作者:Yadong Xu 1 , Yangyang Fu 1 and Huanyang Chen 1,2
摘要:Metamaterials possess exotic properties that do not exist in nature. 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. In particular,
planar gradient metamaterials can be classified into three categories: gradient metasurfaces,
gradient index metamaterials and gradient metallic gratings. 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. 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. 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. 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.




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