Tang Jianwei, He Sailing
Opt Express. 2013 Oct 7;21(20):23511-21. doi: 10.1364/OE.21.023511.
We derive an analytical LC model from Maxwell's equations for the magnetic resonance of subwavelength ring resonators. Using the LC model, we revisit the scaling of split-ring resonators. Inspired by the LC model, we propose a hybrid metal-dielectric ring resonator mainly composed of high index dielectric material (e.g., TiO₂) with some gaps filled with metal (e.g., Ag). The saturation frequency of magnetic response for the hybrid metal-dielectric ring resonator is much higher (up to the ultraviolet range) than that for split-ring resonators, and can be controlled by the metal fraction in the ring. The hybrid metal-dielectric ring resonator can also overcome the homogenization problem of all-dielectric magnetic resonators, and therefore can form homogenizable magnetic metamaterials at short wavelengths down to the ultraviolet range.
我们从麦克斯韦方程组推导出用于亚波长环形谐振器磁共振的解析LC模型。利用该LC模型，我们重新审视了裂环谐振器的缩放比例。受LC模型启发，我们提出了一种混合金属 - 电介质环形谐振器，其主要由高折射率电介质材料（如TiO₂）组成，一些间隙填充有金属（如Ag）。混合金属 - 电介质环形谐振器的磁响应饱和频率比裂环谐振器高得多（高达紫外范围），并且可以通过环中的金属比例来控制。混合金属 - 电介质环形谐振器还可以克服全电介质磁谐振器的均匀化问题，因此可以在短至紫外范围的波长下形成可均匀化的磁性超材料。
