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首页> 外文期刊>Physical Review. B, Condensed Matter >Shadow-free multimers as extreme-performance meta-atoms
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Shadow-free multimers as extreme-performance meta-atoms

机译：无阴影的多聚体作为超高性能的元原子

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摘要

We generalize the concept of parity-time symmetric structures with the goal to create meta-atoms exhibiting extraordinary abilities to overcome the presumed limitations in the scattering of overall lossless particles, such as nonzero forward scattering and the equality of scattering and extinction powers for all lossless particles. Although the forward scattering amplitude and the extinction cross section of our proposed meta-atoms vanish, they scatter incident energy into other directions, with controllable directionality. These meta-atoms possess extreme electromagnetic properties not achievable for passive scatterers. As an example, we study meta-atoms consisting of two or three small dipole scatterers. We consider possible microwave realizations in the form of short dipole antennas loaded by lumped elements. The proposed meta-atom empowers extraordinary response of a shadow-free scatterer and theoretically enables most unusual material properties when used as a building block of an artificial medium.
机译：我们推广奇偶时间对称结构的概念，其目标是创建具有超强能力的亚原子，以克服总体无损粒子散射中的假定限制，例如非零前向散射以及所有无损散射和消光力相等粒子。尽管我们提出的亚原子的前向散射幅度和消光截面消失了，但它们将入射能量散射到其他方向，方向性可控。这些超原子具有无源散射体无法实现的极端电磁特性。例如，我们研究由两个或三个小偶极子散射体组成的亚原子。我们考虑通过集总元件加载的短偶极天线形式的微波实现。所提出的超原子赋予了无阴影散射体非凡的响应性，并且在用作人造介质的构造块时，从理论上讲使大多数不寻常的材料特性成为可能。

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  • 来源
    《Physical Review. B, Condensed Matter》 |2018年第8期|085412.1-085412.10|共10页
  • 作者

    M. Safari; M. Albooyeh; C. R. Simovski; S. A. Tretyakov;

  • 作者单位

    Department of Electrical Engineering, Iran University of Science and Technology, Nartnak, Tehran, Iran;

    Department of Electrical Engineering and Computer Science, University of California, Irvine, California 92617, USA;

    Department of Electronics and Nanoengineering, Aalto University, P. O. Box 15500, FI-00076 Aalto, Finland;

    Department of Electronics and Nanoengineering, Aalto University, P. O. Box 15500, FI-00076 Aalto, Finland;

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