Kerker型位置无序免疫超表面
Kerker-Type Positional Disorder Immune Metasurfaces
AI总结：
本文提出两种由满足第一、第二Kerker条件的核壳圆柱构成的位置无序免疫超表面，揭示其弱横向耦合机制，并证明其在强扰动下仍保持全透射与磁镜性能。
摘要：
能够在不要求超原子严格周期排列的情况下工作的超表面，是实际光学微纳器件所迫切需要的。在本工作中，我们提出了两种具有位置无序免疫性的Kerker型超表面。这些超表面由两种不同的核壳圆柱组成，分别满足第一和第二Kerker条件。即使超原子受到较大的位置无序扰动，这些超表面仍能保持与周期性超表面同样优异的性能，例如全透射和磁镜响应。这种无序免疫性源于单个核壳圆柱的单向前向和后向散射，使相邻圆柱之间的横向耦合非常弱，从而几乎不会影响前向或后向方向上的多重散射。相比之下，无序的非Kerker型超表面的主导响应显著下降。我们的发现为设计鲁棒超表面提供了新思路，并拓展了超表面在复杂实际环境下传感和通信中的应用范围。
英文摘要：
Metasurfaces that can work without the rigorous periodic arrangement of meta-atoms are highly desired by practical optical micro-nano devices. In this work, we proposed two kinds of Kerker-type metasurfaces possessing positional disorder immunity. The metasurfaces are composed of two different core-shell cylinders satisfying the first and second Kerker conditions, respectively. Even with large positional disorder perturbation of the meta-atoms, the metasurfaces can still maintain the same excellent performances as periodic ones, such as the total transmission and magnetic mirror responses. This disorder immunity is due to the unidirectional forward and backward scatterings of a single core-shell cylinder leading to very weak lateral couplings between neighboring cylinders thus rarely affecting the multiple scatterings in the forward or backward direction. In contrast, the dominant response of the disordered non-Kerker-type metasurface decreases significantly. Our findings provide a new idea for designing robust metasurfaces and extend the scope of metasurface applications in sensing and communication under complex practical circumstances.
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