arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1009.4348physics.opticscond-mat.mtrl-sci
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球形隐身/反隐身相互作用的分析研究

Analytical study of spherical cloak/anti-cloak interactions

Giuseppe Castaldi, Ilaria Gallina, Vincenzo Galdi, Andrea Alu', Nader Engheta

摘要:

最近在变换光学(TO)的框架内引入了“反隐身”的有趣概念,首先作为对隐形隐身的“对策”(即,恢复隐形目标的散射响应),以及最近与“传感器不可见性”(即,以在保持场感测能力的同时强烈地减小散射响应)。在本文中,我们扩展我们以前的研究,这是有限的二维圆柱形的情况下,三维球形的情况下。更具体地说,通过广义(坐标映射)米氏系列的方法,我们推导出一个一般的解析全波解有关的平面波激发的配置具有一个球形物体包围的TO为基础的隐形斗篷耦合通过真空层的反斗篷,并探讨各种感兴趣的相互作用。与一些选定的例子,我们说明了各种配置的隐身和字段恢复能力,突出的相似性和差异,相对于圆柱形的情况下,特别强调传感器隐身方案和想法的近似实现,需要使用双阳性介质。

英文摘要:

The intriguing concept of "anti-cloaking" has been recently introduced within the framework of transformation optics (TO), first as a "countermeasure" to invisibility-cloaking (i.e., to restore the scattering response of a cloaked target), and more recently in connection with "sensor invisibility" (i.e., to strongly reduce the scattering response while maintaining the field-sensing capabilities). In this paper, we extend our previous studies, which were limited to a two-dimensional cylindrical scenario, to the three-dimensional spherical case. More specifically, via a generalized (coordinate-mapped) Mie-series approach, we derive a general analytical full-wave solution pertaining to plane-wave-excited configurations featuring a spherical object surrounded by a TO-based invisibility cloak coupled via a vacuum layer to an anti-cloak, and explore the various interactions of interest. With a number of selected examples, we illustrate the cloaking and field-restoring capabilities of various configurations, highlighting similarities and differences with respect to the cylindrical case, with special emphasis on sensor-cloaking scenarios and ideas for approximate implementations that require the use of double-positive media only.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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