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Scattering invariance for arbitrary polarizations protected by joint spatial-duality symmetries.
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论文类型：期刊论文
发表刊物：Physical Review B
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：15
页面范围：155427
关键字：无
DOI码：10.1103/PhysRevB.102.155427
发表时间：2020-10-13
教研室：c716
摘要：We reveal how to exploit joint spatial-electromagnetic duality symmetries to obtain invariant scattering properties (including extinction, scattering, absorption) of self-dual scattering systems for incident waves of arbitrary polarizations. The electromagnetic duality ensures the helicity preservation along all scattering directions and thus intrinsically eliminates the interferences between the two scattering channels originating from the circularly polarized components of incident waves. This absence of interference directly secures invariant scattering properties for all polarizations located on the same latitude circle of the Poincaré sphere, which are characterized by polarization ellipses of the same eccentricity and handedness. Further incorporations of mirror and/or inversion symmetries would lead to such invariance throughout the whole Poincaré sphere, guaranteeing invariant scattering properties for all polarizations. Simultaneous exploitations of composite symmetries of different natures render an extra dimension of freedom for scattering manipulations, offering new insights for both fundamental explorations and optical device engineering related to symmetry-dictated light-matter interactions.
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