Mapping the Magnetic Field Intensity of Light with the Nonlinear Optical Emission of a Silicon Nanoparticle
Mapping the Magnetic Field Intensity of Light with the Nonlinear Optical Emission of a Silicon Nanoparticle
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用硅纳米颗粒的非线性光发射绘制光的磁场强度
DOI：
10.1021/acs.nanolett.0c04706
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发表时间：
2021-03-02
期刊：
影响因子：
10.8
通讯作者：
Lei, Dangyuan
中科院分区：
文献类型：
--
作者：
Li, Guang-Can;Xiang, Jin;Lei, Dangyuan
为了检测任意未知光场的磁分量，候选探针必须满足一系列苛刻的要求，包括空间各向同性磁响应、抑制电效应和宽工作带宽。在这里，我们表明，硅纳米粒子满足所有这些要求，其光磁驱动的多光子发光，使直接映射的磁场强度分布的紧密聚焦的飞秒激光束具有不同的偏振方向和空间重叠的电和磁组件。我们的工作建立了一个强大的非线性光学范式，探测未知的光学磁场的任意电磁结构，这不仅是必要的，实现亚波长尺度的光学磁学，但也有利于纳米光子研究中的磁光-物质相互作用制度。
To detect the magnetic component of arbitrary unknown optical fields, a candidate probe must meet a list of demanding requirements, including a spatially isotropic magnetic response, suppressed electric effect, and wide operating bandwidth. Here, we show that a silicon nanoparticle satisfies all these requirements, and its optical magnetism driven multiphoton luminescence enables direct mapping of the magnetic field intensity distribution of a tightly focused femtosecond laser beam with varied polarization orientation and spatially overlapped electric and magnetic components. Our work establishes a powerful nonlinear optics paradigm for probing unknown optical magnetic fields of arbitrary electromagnetic structures, which is not only essential for realizing subwavelength-scale optical magnetometry but also facilitates nanophotonic research in the magnetic light-matter interaction regime.