Optical Magnetic Field Enhancement by Strong Coupling in Metamaterials
Optical Magnetic Field Enhancement by Strong Coupling in Metamaterials
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DOI：
10.1109/jlt.2018.2822777
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发表时间：
2018-07-01
影响因子：
4.7
通讯作者：
Park, Gun-Sik
中科院分区：
文献类型：
--
作者：
Chen, Jing;Nie, Hai;Park, Gun-Sik
我们从理论上研究了超材料中光波导模式和磁共振之间的相互作用效应，该超材料由位于介电波导衬底上的成对金属纳米盘周期阵列组成。单个金属纳米盘对中的等离子体激元近场耦合导致磁共振。成对金属纳米盘的周期性布置可以激发在相邻电介质波导中传播的光波导模式。当光波导模式通过改变阵列周期接近磁共振时，它们相互作用形成两个杂化模式。本文还提出了一个双振子耦合模型，较好地预测了杂化模的位置。在强相互作用区，杂化模具有明显的反交叉，并表现出有趣的拉比分裂现象。此外，金属纳米盘对内的磁场也表现出极大的增强，这在磁非线性和传感器方面有着潜在的应用前景。
We study theoretically the interaction effects between optical waveguide modes and magnetic resonances in metamaterials, consisting of periodic arrays of paired metallic nanodisks lying on a dielectric waveguide substrate. The plasmon near-field coupling in individual metallic nanodisk pairs results into magnetic resonances. The periodic arrangement of the paired metallic nanodisks can excite optical waveguide modes propagating in the adjacent dielectric waveguide. When optical waveguide modes are close to magnetic resonances by varying the array period, they interact to form two hybridized modes. A coupling model of two oscillators is also proposed to predict well the positions of the hybridized modes. In the strong interaction regime, the hybridized modes have an obvious anticrossing, and thus exhibit an interesting phenomenon of Rabi splitting. Furthermore, the magnetic fields within metallic nanodisk pairs exhibit a huge enhancement, which could find promising potential applications in magnetic nonlinearity and sensors.