Magnetic assembly of gold core-shell necklace resonators
Magnetic assembly of gold core-shell necklace resonators
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DOI：
10.1063/1.4706254
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发表时间：
2012-04-30
影响因子：
4
通讯作者：
Tanaka, Takuo
中科院分区：
文献类型：
--
作者：
Aoki, Kanna;Furusawa, Kentaro;Tanaka, Takuo
利用外加磁场感应镀金顺磁性微球和抗磁性微球的磁矩，组装成金核-壳项链结构。仅通过控制背景介质的磁导率就可以调节项链结构中的球数。由均匀分布的金属球体或圆盘组成的项链结构是等离子体共振的良好介质。因此，我们对它们的光学性质进行了数值研究。在共振波长下，相邻球体之间的空隙中的电场增强估计为1800倍。文中还讨论了我们的结构对可见光波长的定标策略。(C)2012年美国物理研究所。[http://dx.doi.org/10.1063/1.4706254]
Gold core-shell necklace structures are assembled by inducing magnetic moments of gold-coated paramagnetic microspheres and a diamagnetic sphere using an external magnetic field. Sphere numbers in a necklace structure was tuned solely by controlling magnetic permeability of background medium. A necklace structure consisting of evenly spaced metal spheres or disks is known to be a good medium for a plasmonic resonance. Therefore, their optical properties were numerically studied. The electric field enhancement by a factor of 1800 was estimated in the gaps between adjacent spheres at a resonant wavelength. The wavelength-scaling strategies of our structures to visible wavelength are also discussed. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4706254]