Near-field plates and the near zone of metasurfaces

Nanophotonics

article

Roberto Merlin¹ 

[1] The Harrison M. Randall Laboratory of Physics, University of Michigan

关键词: electromagnetic near field;    metasurfaces;    near-field plates;    subwavelength focusing;    wireless power transfer;   

DOI  :  10.1515/nanoph-2020-0307

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

A brief, tutorial account is given of the differences between the near and far regions of the electromagnetic field emphasizing the source-dependent behavior of the former and the universal properties of the latter. Field patterns of near-field plates, that is, metasurfaces used for sub-wavelength applications, are discussed in some detail. Examples are given of fields that decay away from the plates in an exponential manner, a ubiquitous feature of many interface problems, and metasurfaces for which the decay is not exponential, but algebraic. It is also shown that a properly designed system of two parallel near-field plates can produce fields that exhibit pseudo minima, which are potentially useful for near-field tweezer-like applications.

【 授权许可】

CC BY