Long-Range Coupling of Toroidal Moments for the Visible,ACS Photonics

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Long-Range Coupling of Toroidal Moments for the Visible
ACS Photonics ( IF 6.5 ) Pub Date : 2018-01-27 00:00:00 , DOI: 10.1021/acsphotonics.7b01313
Surong Guo ₁ , Nahid Talebi ₁ , Peter A. van Aken ₁

Affiliation

Dynamic toroidal multipoles are the third independent family of elementary electromagnetic sources in addition to electric and magnetic multipoles. Whereas the dipole–dipole coupling in electric and magnetic multipole families has been well studied, such fundamental coupling effects in the toroidal multipole family have not yet been experimentally investigated. Here we propose a plasmonic decamer nanocavity structure to realize transverse coupling between magnetic toroidal dipoles. The coupling effect was investigated both experimentally and theoretically, by means of electron energy-loss spectroscopy and energy-filtered transmission electron microscopy, together with finite-difference time-domain calculations. We observe that the coupling causes a reorientation of the magnetic moment loops surrounding the initial toroidal moments. This coupling results in three eigenstates of this toroidal system. The underlying coupling mechanism is qualitatively demonstrated. Our investigations pave the way toward a better understanding of coupling phenomena of toroidal moments and will bias applications in the long-range ordering of moments in metamaterials, e.g., for transfer of electromagnetic energy using toroidal moments (by analogy with chain metallic waveguides).

中文翻译：

环形力矩的远距离耦合

动态环形多极子是电和磁多极子之外的第三个独立的基本电磁源族。尽管已经对电和磁多极族中的偶极-偶极耦合进行了深入研究，但尚未对环形多极族中的这种基本耦合效应进行实验研究。在这里，我们提出了一种等离激元迪卡默纳米腔结构，以实现环形磁偶极子之间的横向耦合。通过电子能量损失谱和能量滤波的透射电子显微镜，以及有限差分时域计算，对耦合效应进行了实验和理论研究。我们观察到耦合会引起围绕初始环形磁矩的磁矩环的重新定向。这种耦合导致该环形系统的三个本征态。定性地证明了潜在的偶联机制。我们的研究为更好地理解环矩耦合现象铺平了道路，并将偏向应用超材料中矩的远距离排序，例如使用环矩传递电磁能量（类似于链式金属波导）。

更新日期：2018-01-27

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