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Scattering and absorption invariance of nonmagnetic particles under duality transformations
Physical Review A ( IF 2.9 ) Pub Date : 2020-09-18 , DOI: 10.1103/physreva.102.033517
Qingdong Yang , Weijin Chen , Yuntian Chen , Wei Liu

We revisit the total scatterings (in terms of extinction, scattering, and absorption cross sections) by arbitrary clusters of nonmagnetic particles that support optically induced magnetic responses. Our reexamination is conducted from the perspective of the electromagnetic duality symmetry, and it is revealed that all total scattering properties are invariant under duality transformations. This secures that, for self-dual particle clusters, the total scattering properties are polarization independent for any fixed incident direction, while, for non-self-dual particle clusters, two scattering configurations that are connected to each other through a duality transformation would exhibit identical scattering properties. This electromagnetic duality induced invariance is irrelevant to specific particle distributions or wave incident directions, which is illustrated for both random and periodic clusters.

中文翻译:

二元变换下非磁性粒子的散射和吸收不变性

我们通过支持光感应磁响应的非磁性粒子的任意簇,重新研究了总散射(就消光,散射和吸收截面而言)。我们从电磁对偶对称性的角度进行了重新检查,结果表明在对偶变换下所有总散射特性都是不变的。这确保了,对于自对偶粒子簇,总散射特性对于任何固定入射方向都是偏振无关的,而对于非自对偶粒子簇,将通过对偶变换显示彼此连接的两个散射配置相同的散射特性。这种电磁对偶引起的不变性与特定的粒子分布或波入射方向无关,
更新日期:2020-09-20
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