偶极子
磁偶极子
散射
物理
光散射
凝聚态物理
离散偶极子近似
磁场
电偶极子跃迁
共振(粒子物理)
原子物理学
光学
量子力学
作者
Tianhua Feng,Yi Xu,Wei Zhang,Andrey E. Miroshnichenko
标识
DOI:10.1103/physrevlett.118.173901
摘要
We introduce the concept of tunable ideal magnetic dipole scattering, where a nonmagnetic nanoparticle scatters lights as a pure magnetic dipole. High refractive index subwavelength nanoparticles usually support both electric and magnetic dipole responses. Thus, to achieve ideal magnetic dipole scattering one has to suppress the electric dipole response. Such a possibility was recently demonstrated for the so-called anapole mode, which is associated with zero electric dipole scattering. By overlapping magnetic dipole resonance with the anapole mode we achieve ideal magnetic dipole scattering in the far-field with tunable high scattering resonances in near infrared spectrum. We demonstrate that such condition can be realized for two subwavelength geometries. One of them is core-shell nanosphere consisting of Au core and silicon shell. It can be also achieved in other geometries, including nanodisks, which are compatible with current nanofabrication technology.
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