介电低聚物的磁八极响应
Magnetic Octupole Response of Dielectric Oligomers
摘要：
在现代纳米光子学中，发展新的方法来调节简单的全介质纳米结构的共振磁响应是非常重要的。在这里，我们表明，共振磁八极（MOCT）的响应，可以通过划分一个固体矩形硅块的低聚物结构与四个纳米立方体之间的窄间隙的介绍。我们通过改变纳米立方体之间的距离来控制和调谐MOCT共振的光谱位置。我们证明了几个磁热点相关的MOCT共振可以位于间隙中创建一个强大的磁场梯度在自由空间。我们观察到，MOCT矩的共振激发导致在光谱区域，在体硅中的光吸收是弱的系统中的光吸收的显着增强。这项工作的结果可以应用于设计新的复合天线和超材料的基础上复杂的积木，能量收集设备和分子捕获与磁热点。
英文摘要：
The development of new approaches to tuning the resonant magnetic response of simple all-dielectric nanostructures is very important in modern nanophotonics. Here we show that a resonant magnetic octupole (MOCT) response can be obtained by dividing a solid rectangular silicon block to an oligomer structure with the introduction of narrow gaps between four nanocubes. We control and tune the spectral position of the MOCT resonance by varying the distance between the nanocubes. We demonstrate that several magnetic hot-spots related to the MOCT resonance can be located in the gaps creating a strong magnetic field gradient in free space. We observe that the resonant excitation of the MOCT moment leads to a significant enhancement of light absorption in the system at the spectral region, where light absorption in bulk silicon is weak. The results of this work can be applied to design new composite antennas and metamaterials based on complex building blocks, energy harvesting devices and molecular trapping with magnetic hot-spots.
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