We propose a refractometric sensor based on hollow silicon Mie resonators of a toroidal magnetic dipole mode. This mode has a pair of antiparallel electric dipoles perpendicular to the silica substrate; thus, the radiation of the mode is suppressed, resulting in an ultra-narrow reflection peak linewidth of 0.35 nm. In addition, the hollow structure enhances the interaction between the enhanced electric field and the surrounding medium, thus improving the sensitivity. The proposed Mie resonators achieve a sensitivity of 486 nm RIU⁻¹ and a figure of merit up to 1389 RIU⁻¹, which are ideal for refractometric sensing.

中文翻译：

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基于环形磁偶极子模式的空心米氏谐振器，在折射传感中具有增强的灵敏度

我们提出了一种基于环形磁偶极模式的空心硅米氏谐振器的折射传感器。该模式具有一对垂直于二氧化硅基底的反平行电偶极子；因此，模式的辐射被抑制，从而产生0.35 nm的超窄反射峰线宽。此外，中空结构增强了增强电场与周围介质的相互作用，从而提高了灵敏度。^{所提出的 Mie 谐振器实现了 486 nm RIU -1}的灵敏度和高达 1389 RIU ^-1的品质因数，非常适合折射测量。