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Electromagnetic Duality Protected Scattering Properties of Nonmagnetic Particles
ACS Photonics ( IF 6.5 ) Pub Date : 2020-06-18 , DOI: 10.1021/acsphotonics.0c00555 Qingdong Yang 1 , Weijin Chen 1 , Yuntian Chen 1, 2 , Wei Liu 3
ACS Photonics ( IF 6.5 ) Pub Date : 2020-06-18 , DOI: 10.1021/acsphotonics.0c00555 Qingdong Yang 1 , Weijin Chen 1 , Yuntian Chen 1, 2 , Wei Liu 3
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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.
中文翻译：
非磁性粒子的电磁双重保护散射特性
支持人工光学感应的磁响应的非磁性结构的光学性质最近引起了人们的极大兴趣。在这里，我们从具有离散几何旋转的电磁对偶性的角度对非磁性粒子的散射特性进行对称性研究。对于任意散射配置，我们揭示了在对偶变换下，远场散射模式是不变的。特别是，这意味着具有随机粒子分布的自对偶星团的散射模式与偏振无关。在此基础上的启示，可以进一步发现，散射体组合duality-（Ñ倍，Ñ ≥3）旋转对称，对于入射波的任何偏振，还表现出Ñ零向后旋转对称的旋转对称散射图谱，自动满足广义Kerker条件的向后散射抑制。我们仅基于支持光感应偶极子共振的非磁性核-壳粒子，就运用偶极子耦合理论和完整的数值模拟来证明这些散射特性。那些实质性的散射特性是由基本对称原理完全诱发的，因此可以经受住任何不破坏对称的干扰，这可能会在需要本质上强大功能的各种光学设备中找到应用。
更新日期：2020-07-15
中文翻译：
非磁性粒子的电磁双重保护散射特性
支持人工光学感应的磁响应的非磁性结构的光学性质最近引起了人们的极大兴趣。在这里，我们从具有离散几何旋转的电磁对偶性的角度对非磁性粒子的散射特性进行对称性研究。对于任意散射配置，我们揭示了在对偶变换下，远场散射模式是不变的。特别是，这意味着具有随机粒子分布的自对偶星团的散射模式与偏振无关。在此基础上的启示，可以进一步发现，散射体组合duality-（Ñ倍，Ñ ≥3）旋转对称，对于入射波的任何偏振，还表现出Ñ零向后旋转对称的旋转对称散射图谱，自动满足广义Kerker条件的向后散射抑制。我们仅基于支持光感应偶极子共振的非磁性核-壳粒子，就运用偶极子耦合理论和完整的数值模拟来证明这些散射特性。那些实质性的散射特性是由基本对称原理完全诱发的，因此可以经受住任何不破坏对称的干扰，这可能会在需要本质上强大功能的各种光学设备中找到应用。
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