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arXiv 2205.01082physics.opticscond-mat.mes-hall
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双各向异性响应的多极理论

Multipolar theory of bianisotropic response

Maria Poleva, Kristina Frizyuk, Kseniia Baryshnikova, Andrey Bogdanov, Mihail Petrov, Andrey Evlyukhin

摘要:

亚原子的双各向异性通常与它们的非局域响应以及入射场诱导的电、磁偶极矩之间的相互耦合有关。在这项工作中,我们推广的双各向异性超越偶极响应的情况下,任意高阶多极共振的理论。我们证明了双各向异性是完全由亚原子的反转对称性的情况下。双各向异性响应的强度通常随着元原子的大小而增加,但其起源完全与结构的对称性有关。作为一个重要的例子bianisotropic粒子,我们考虑一个三棱柱,并显示如何占高阶多极防止违反的Onsager-Casimir条件的动力学系数出现在偶极近似。发展的理论是一个重要的一步,更深入地了解纳米天线和元原子的散射特性。

英文摘要:

Bianisotropy of metaatoms is usually associated with their nonlocal response and the mutual coupling between electric and magnetic dipole moments induced by the incident field. In this work, we generalize the theory of bianisotropy beyond the dipole response to the cases of arbitrary high-order multipole resonances. We demonstrate that bianisotropy is exclusively caused by the absence of the inversion symmetry of metaatoms. The strength of the bianisotropy response is normally increased with the size of a meta-atom but its origin is fully connected to the symmetry of the structure. As an important example of bianisotropic particle, we consider a triangular prism and show how accounting for the higher-order multipoles prevents the violation of the Onsager-Casimir conditions for kinetic coefficients appearing in the dipole approximation. The developed theory is an important step towards a deeper insight into the scattering properties of nanoantennas and meta-atoms.

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