Abstract We propose a ring-groove nanostructure which can achieve toroidal dipolar resonance under normal incidence, and find that this design, due to the strong field confinement for this dipolar resonance, can simultaneously enhance the radiative decay rate and achieve high degree of linear polarization of the fluorescence emission. In addition, both radiation enhancement and degree of linear polarization are higher than those by other structure that cannot obtain toroidal dipolar resonance. It is expected that this design can promote the development of polarized light-emitting devices with enhanced emission intensity and potentially functional toroidal metasurface lasers.

中文翻译：

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通过环形凹槽超结构中的等离子体环形偶极共振控制荧光发射

摘要 我们提出了一种可以在法向入射下实现环形偶极共振的环槽纳米结构，并发现这种设计由于这种偶极共振的强场限制，可以同时提高辐射衰减率并实现高度的线性极化。荧光发射。此外，辐射增强和线性极化程度都高于其他无法获得环形偶极共振的结构。预计这种设计可以促进具有增强的发射强度和潜在功能的环形超表面激光器的偏振发光器件的发展。