Multiple Kerker Anapoles in Dielectric Microspheres,Laser & Photonics Reviews

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Multiple Kerker Anapoles in Dielectric Microspheres
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-06-02 , DOI: 10.1002/lpor.202100035
Cristina Sanz‐Fernández ₁ , Martín Molezuelas‐Ferreras ₁ , Jon Lasa‐Alonso _{1,

2} , Nuno de Sousa ₂ , Xavier Zambrana‐Puyalto ₃ , Jorge Olmos‐Trigo _{2,

3}

Affiliation

High refractive index dielectric spheres present remarkable light-scattering properties in the spectral range dominated by dipolar modes. However, most of these properties are absent for larger spheres under plane wave illumination. Here, a proposal to unravel these dipolar regimes for larger particles under the illumination of a pure dipolar field is presented. This type of illumination ensures that the scattering response of the sphere is purely dipolar. In this scenario, it is shown that Kerker conditions are not only related to duality symmetry and a strong backward-to-forward asymmetric light-scattering, but also to the appearance of non-radiating sources: the so-called hybrid anapoles. Finally, it is shown that all the above-mentioned scattering features under dipolar illumination are reproducible with an experimentally accessible tightly-focused Gaussian beam.

中文翻译：

介电微球中的多个 Kerker Anapoles

高折射率介电球在偶极模式主导的光谱范围内表现出显着的光散射特性。然而，在平面波照明下，较大的球体不存在大多数这些特性。在这里，提出了在纯偶极场的照射下解开较大粒子的这些偶极区的建议。这种类型的照明确保球体的散射响应是纯偶极的。在这种情况下，表明 Kerker 条件不仅与对偶对称性和强烈的前后不对称光散射有关，而且与非辐射源的出现有关：所谓的混合 anapoles。最后，

更新日期：2021-07-08

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