论文标题
近场板和近腹区域
Near-field plates and the near zone of metasurfaces
论文作者
论文摘要
简要介绍了Elec-tromagnetic场的近距离区域和远处之间的差异，该区域强调了前者的源依赖性行为以及后者的普遍特性。详细讨论了近场板的现场模式，即用于次波长应用的元图。示例是以指数方式从板上衰减的字段，许多接口问题的无处不在特征，以及衰减不是指数级而是代数的元图。还表明，一个由两个平行的近场板组成的正确设计的系统可以生产出具有伪最小值的场，这对于近场镊子样应用可能有用。
A brief, tutorial account is given of the differences between the near and far regions of the elec-tromagnetic 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.
