arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1609.08041physics.optics
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从广义反射定律到理想反常反射体的实现

From the generalized reflection law to the realization of perfect anomalous reflectors

Ana Díaz-Rubio, Viktar Asadchy, Amr Elsakka and, Sergei Tretyakov

摘要:

广义斯涅耳定律的使用为操纵透射和反射波前提供了广泛的可能性。然而,被设计成使反射波前成形的已知结构在不期望的方向上遭受显著的寄生反射:事实上,如果根据广义的斯涅耳定律指定边界条件,则期望的场分布不满足麦克斯韦方程。在这项工作中,我们探讨了现有的无源平面反射器的设计解决方案的局限性,并证明了强烈的非局部响应是完美的性能所需的。能够将能量转向到任何期望方向的理想反射表面必须沿着非均匀反射表面局部化和携带能量。介绍了一种新的基于能量表面沟道的理想反射镜设计方法。我们实现并实验验证了一个理论上完美的设计,使用一个阵列的矩形金属贴片的金属板支持的反射表面。这种概念上的波前操纵新机制允许设计薄的完美反射器,提供了一种通用的设计方法,适用于其他场景,如聚焦反射器或表面波操纵,可扩展到其他频率。

英文摘要:

The use of the generalized Snell's law opens wide possibilities for the manipulation of transmitted and reflected wavefronts. However, known structures designed to shape reflection wave fronts suffer from significant parasitic reflections in undesired directions: In fact, the desired field distributions do not satisfy Maxwell's equations if the boundary conditions are specified in accordance with the generalized Snell's law. In this work, we explore the limitations of the existing solutions for the design of passive planar reflectors and demonstrate that strongly non-local response is required for perfect performance. Ideal reflective surfaces capable of steering the energy into any desired direction have to localize and carry energy along the inhomogeneous reflective surface. A new paradigm for the design of perfect reflectors based on energy surface channeling is introduced. We realize and experimentally verify a theoretically perfect design of an anomalously reflective surface using an array of rectangular metal patches backed by a metallic plate. This conceptually new mechanism for wavefront manipulation allows the design of thin perfect reflectors, offering a versatile design method applicable to other scenarios such as focusing reflectors or surface wave manipulations, extendible to other frequencies.

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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