Magnetic Purcell Enhancement by Magnetic Quadrupole Resonance of Dielectric Nanosphere Antenna,ACS Photonics

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Magnetic Purcell Enhancement by Magnetic Quadrupole Resonance of Dielectric Nanosphere Antenna
ACS Photonics ( IF 6.5 ) Pub Date : 2021-05-17 , DOI: 10.1021/acsphotonics.1c00375
Hiroshi Sugimoto _{1,

2} , Minoru Fujii ₁

Affiliation

Dielectric nanoantennas have been suggested for manipulating the spontaneous emission of a magnetic dipole through the magnetic Purcell effect. However, the experimentally observed enhancement of the magnetic dipole emission has been marginal and much smaller than the theoretical prediction. Here, we develop a composite system, that is, a Si nanosphere decorated with Eu³⁺ complexes, in which magnetic dipole emission of Eu³⁺ is efficiently coupled to the magnetic Mie modes of the nanosphere. By means of single particle spectroscopy, we systematically investigate the light scattering and photoluminescence spectra of the coupled system with diameters of Si nanospheres from 130 to 245 nm. We demonstrate that, by tuning the magnetic quadrupole Mie resonance to the ⁵D₀–⁷F₁ magnetic dipole transition of Eu³⁺, the branching ratio between the magnetic and electric dipole transitions is enhanced up to 7×. We also show the magnetic Purcell enhancement in an ensemble of Si nanospheres with size distribution.

中文翻译：

介电纳米球天线的磁四极共振增强磁珀塞尔

介电纳米天线已被建议用于通过磁珀塞尔效应操纵磁偶极子的自发发射。然而，实验观察到的磁偶极子发射的增强微乎其微，远小于理论预测。在这里，我们开发了复合体系，即，在Si纳米球装饰用Eu ³⁺络合物，其中铕磁偶极子发射³⁺被有效地耦合到纳米球的磁性三重模式。通过单粒子光谱，我们系统地研究了直径为 130 到 245 nm 的 Si 纳米球耦合系统的光散射和光致发光光谱。我们证明，通过将磁四极杆 Mie 共振调谐到⁵Eu ^{3+ 的}D ₀ – ⁷ F ₁磁偶极跃迁，磁偶极跃迁和电偶极跃迁之间的分支比提高了7倍。我们还展示了具有尺寸分布的 Si 纳米球整体中的磁性珀塞尔增强。

更新日期：2021-06-17

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