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首页> 外文会议>Conference on Adaptive Optics and Applications II, Oct 15-16, 2002, Shanghai, China >Wavefront control of microwaves with a conductive mesostructure: theory
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Wavefront control of microwaves with a conductive mesostructure: theory

机译：具有导电介观结构的微波的波前控制：理论

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摘要

The initial theory for a novel type of wavefront controller for microwaves is described. This controller is based on the principle that the effective refractive index of a structure is a square root product between the permittivity and permeability of a material, n = (εμ)~(1/2). With high conductivity metals, such as silver, light acquires an effective mass so that, the longitudinal mode has a finite frequency known as the plasma frequency, ω_p. Below that frequency the dielectric function is negative, allowing no modes in the bulk of the metal. This is responsible for the amazing and unique properties of structured metals. One may, by extension of scale, design a metallic structure whose effective ε is negative, for wavelengths longer than the structure's unit cell. Such structures have been suggested recently by Pendry et al. The symmetry of Maxwell's equations implies that magnetic structures can be engineered from non-magnetic materials, so that an effective μ is produced down to negative values. An example of such a structure is investigated here in detail. I also discuss how the electric and magnetic structures are combined to produced a controllable refractive index over the unit cell, implying that we can construct wavefront controllers from conductive mesostructures.
机译：描述了一种新型的微波波前控制器的初始理论。该控制器基于以下原理：结构的有效折射率是材料的介电常数和磁导率之间的平方根乘积，n =（εμ）〜（1/2）。对于高电导率的金属（例如银），光会获得有效质量，因此，纵向模式具有称为等离子体频率ω_p的有限频率。在该频率以下，介电函数为负，因此在金属主体中不允许出现模态。这是结构化金属惊人而独特的特性的原因。通过扩展规模，可以设计一种金属结构，其有效ε为负，波长比该结构的单位晶胞更长。 Pendry等人最近提出了这样的结构。麦克斯韦方程组的对称性意味着可以用非磁性材料来构造磁性结构，从而有效的μ可以产生到负值。这里详细研究这种结构的例子。我还将讨论如何将电和磁结构组合在一起以在晶胞上产生可控的折射率，这意味着我们可以从导电介观结构构造波前控制器。

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