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论文类型：期刊论文

发表刊物：ACS Photonics

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：工学

项目来源：自然科学基金

文献类型：J

卷号：7

期号：7

页面范围：1830-1838

关键字：Mie scattering ，electromagnetic duality ，optically induced magnetism ，generalized Kerker scattering ，core−shell particles

DOI码：10.1021/acsphotonics.0c00555

发表时间：2020-06-18

教研室：c716

摘要：Optical properties of nonmagnetic structures that support artificial optically induced magnetic responses have recently attracted surging interest. Here we conduct symmetry-dictated investigations into scattering properties of nonmagnetic particles from perspectives of electromagnetic duality with discrete geometric rotations. For arbitrary scattering configurations, we reveal that far-field scattering patterns are invariant under duality transformations; in particular, this means that scattering patterns of self-dual clusters with random particle distributions are polarization independent. Based on this revelation, it is further discovered that scattering bodies of combined duality-(n-fold, n ≥ 3) rotation symmetry, for any polarizations of incident waves, exhibit also n-fold rotationally symmetric scattering patterns with zero backward components, satisfying the generalized Kerker condition of backward scattering suppression automatically. We employ both coupled dipole theory and full numerical simulations to demonstrate those scattering properties, solely based upon nonmagnetic core–shell particles that support optically induced dipolar resonances. Those substantiated scattering properties are fully induced by fundamental symmetry principles and thus can survive any non-symmetry-breaking perturbations, which may find applications in a wide range of optical devices that require intrinsically robust functionalities.

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发布期刊链接：https://doi.org/10.1021/acsphotonics.0c00555