Cloaking a sensor via transformation optics.
Cloaking a sensor via transformation optics.
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DOI：
10.1103/physreve.83.016603
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发表时间：
2009-12
期刊：
影响因子：
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通讯作者：
A. Greenleaf;Y. Kurylev;M. Lassas;G. Uhlmann
中科院分区：
文献类型：
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作者：
A. Greenleaf;Y. Kurylev;M. Lassas;G. Uhlmann
理想的变换光学器件在正频率下隐形，除了使隐形区域无法通过入射波的散射而被检测到之外，还可以屏蔽该区域免受这些相同波的影响。相比之下，我们证明近似隐身允许隐身区域和非隐身区域之间的强耦合；仔细选择参数可以放大这种耦合，从而产生屏蔽性能下降的有效斗篷。我们描述的传感器模式与内部共振接近但又不同，后者会破坏隐身功能。作为一项应用，我们描述了如何使用变换光学器件将传感器隐藏在隐身区域，同时使传感器能够有效测量隐身外部的入射波，这种效果类似于 Alù 和 Engheta 基于等离激元的方法。
Ideal transformation optics cloaking at positive frequency, besides rendering the cloaked region invisible to detection by scattering of incident waves, also shields the region from those same waves. In contrast, we demonstrate that approximate cloaking permits a strong coupling between the cloaked and uncloaked regions; careful choice of parameters allows this coupling to be amplified, leading to effective cloaks with degraded shielding. The sensor modes we describe are close to but distinct from interior resonances, which destroy cloaking. As one application, we describe how to use transformation optics to hide sensors in the cloaked region and yet enable the sensors to efficiently measure incident waves on the exterior of the cloak, an effect similar to the plasmon-based approach of Alù and Engheta.