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Scattering and absorption invariance of nonmagnetic particles under duality transformations
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论文类型：期刊论文
发表刊物：Physical Review A
所属单位：光电学院，国家光电研究中心
刊物所在地：美国
学科门类：物理学
项目来源：自然科学基金
文献类型：J
卷号：102
期号：3
页面范围：033517
关键字：无
DOI码：10.1103/PhysRevA.102.033517
发表时间：2020-09-18
教研室：c716
摘要：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.
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