Principles of electromagnetic waves in metasurfaces

发布时间：2017-11-19 20:20

  本文关键词：Principles of electromagnetic waves in metasurfaces

  更多相关文章： metasurface subwavelength structure diffraction limit flat lens perfect absorption

【摘要】：Metasurfaces are artificially structured thin films with unusual properties on demand. Different from metamaterials, the metasurfaces change the electromagnetic waves mainly by exploiting the boundary conditions, rather than the constitutive parameters in three dimensional(3D) spaces. Despite the intrinsic similarities in the operational principles, there is not a universal theory available for the understanding and design of metasurface-based devices. In this article, we propose the concept of metasurface waves(M-waves) and provide a general theory to describe the principles of them. Most importantly, it is shown that the M-waves share some fundamental properties such as extremely short wavelength, abrupt phase change and strong chromatic dispersion, which make them different from traditional bulk waves. It is shown that these properties can enable many important applications such as subwavelength imaging and lithography, planar optical devices, broadband anti-reflection, absorption and polarization conversion. Our results demonstrated unambiguously that traditional laws of diffraction, refraction, reflection and absorption should be revised by using the novel properties of M-waves. The theory provided here may pave the way for the design of new electromagnetic devices and further improvement of metasurfaces. The exotic properties of metasurfaces may also form the foundations for two new sub-disciplines called "subwavelength surface electromagnetics" and "subwavelength electromagnetics".
【作者单位】： State
【基金】：supported by the National Program on Key Basic Research Project(Grant No.2013CBA01700) the National Natural Science Foundation of China(Grant No.61138002)
【分类号】：O441.4
【正文快照】： Light is essential in our understanding of the natural world.Through optical microscope,people can see objects whichcould not be observed with naked eye.In the regime ofgeometric optics,one would expect that extremely smallobject can be distinguished,pro

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