Silicon Nanosphere with Accessible Magnetic Hotspot
Silicon Nanosphere with Accessible Magnetic Hotspot
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DOI：
10.1002/adom.202102574
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发表时间：
2022-02-27
影响因子：
9
通讯作者：
Fujii, Minoru
中科院分区：
文献类型：
--
作者：
Matsumori, Akira;Sugimoto, Hiroshi;Fujii, Minoru
支持磁偶极子（MD）米氏共振的高折射率介质纳米粒子能够在光学频率下产生强增强磁场，并且在增强离子和分子的磁偶极子跃迁等光-物质相互作用方面具有很大的潜力。然而，磁热点通常位于纳米颗粒内部，因此开发进入磁热点的技术仍然是一个紧迫的问题。本文提出了一种具有磁性热点通道孔的硅（Si）纳米球。对具有不同直径和深度孔的硅纳米球进行了数值模拟。在此基础上，提出了一种基于溶液的Si纳米球通道挖孔工艺。本文还提出了一种分析球形纳米天线的纳米空穴诱导各向异性的光谱方法。最后，结合数值模拟和带有纳米孔的硅纳米球的角分辨散射测量结果表明，纳米孔处的磁场强度提高了100倍。
High refractive index dielectric nanoparticles supporting the magnetic dipole (MD) Mie resonance are capable of inducing strongly enhanced magnetic field at an optical frequency, and have great potential for enhancing light-matter interactions such as magnetic dipole transitions of ions and molecules. However, the magnetic hotspot is usually located inside a nanoparticle and thus the development of technology to access the hotspot remains an urgent issue. Here, a silicon (Si) nanosphere having an access hole to the magnetic hotspot is proposed. Numerical simulations for a Si nanosphere with a hole of different diameters and depths are performed. Then, a solution-based process to dig an access hole to a Si nanosphere is developed. A spectroscopic method to analyze nanohole-induced anisotropy of a spherical nanoantenna is also developed. Finally, in combination with numerical simulations and angle-resolved scattering measurements of a Si nanosphere with a nanohole, it is shown that the magnetic field intensity is 100-fold enhanced at the nanohole.