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Multiband superbackscattering via mode superposition in a single dielectric particle

机译:通过模式叠加在单个电介质颗粒中的多频带超保证散射

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摘要

The superposition of resonances in a subwavelength particle can be used to achieve powerful scattering beyond the single channel limit and can also determine the directionality of scattered radiation. It has been proposed that by overlapping modes only with equivalent polarity in the far-field, a "superbackscattering" condition, where the total backscattered power is maximized, can be achieved. This effect can be observed through the simple geometry of a high permittivity, subwavelength sphere with a hollow core, and we demonstrate this experimentally by comparing the radar cross section (RCS) of such structures, attaining a doubling of the RCS compared to a solid particle. Furthermore, we show that several sets of modes can be overlapped at once, leading to a multiband, superbackscattering effect.
机译:在亚波长粒子中的共振叠加可用于实现超出单个通道极限的强大散射,并且还可以确定散射辐射的方向性。 已经提出,通过仅在远场中的等效极性的重叠模式,可以实现“超级保卫散射”条件,其中总反向散射功率最大化。 通过高介电常数的简单几何形状,具有中空芯的亚波长球的简单几何形状可以观察到这种效果,并且通过比较这种结构的雷达横截面(RCS)来证明这一点,与固体颗粒相比,rcs的加倍达到rcs 。 此外,我们表明,几组模式可以立即重叠,导致多频带,超级保证散射效果。

著录项

  • 来源
    《Applied Physics Letters》 |2021年第25期|251107.1-251107.4|共4页
  • 作者单位

    Electromagnetic and Acoustic Materials Group Department of Physics and Astronomy University of Exeter Exeter EX4 4QL United Kingdom;

    Electromagnetic and Acoustic Materials Group Department of Physics and Astronomy University of Exeter Exeter EX4 4QL United Kingdom;

    Electromagnetic and Acoustic Materials Group Department of Physics and Astronomy University of Exeter Exeter EX4 4QL United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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