Near-field optical mapping of single gold nano particles using photo-induced polymer movement of azo-polymers
Near-field optical mapping of single gold nano particles using photo-induced polymer movement of azo-polymers
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DOI：
10.1016/j.optcom.2016.11.028
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发表时间：
2017-03-15
影响因子：
2.4
通讯作者：
Inouye, Yasushi
中科院分区：
文献类型：
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作者：
Ishitobi, Hidekazu;Kobayashi, Taka-aki;Inouye, Yasushi
在这项研究中，通过在单个金纳米粒子(GNPs)附近产生的光学近场来观察空间分辨率超过光的衍射极限的近场分布，从而在偶氮聚合物薄膜中诱导聚合物运动。线偏振(Ex)激光被照射到GNPs中，激发局部表面等离子体共振，增强了GNPs周围的近场。结果表明，不同的GNP直径(即50 nm和80 nm)会导致薄膜上不同的变形图案。将结果与近场分布的理论计算结果进行了比较，结果表明，变形模式依赖于Ex和Ey之间的比率，其中每个Ey具有不同的场分布。
In this study, polymer movement was induced in azo-polymer films by optical near-fields generated in the vicinity of single gold nano particles (GNPs) to visualize near-field distribution with a spatial resolution beyond the diffraction limit of light. A linearly polarized (Ex) laser beam was irradiated into GNPs to excite local surface plasmon resonance that enhanced the near-field around the GNPs. The findings indicated that different GNP diameters (that is, 50 nm and 80 nm) resulted in different deformation patterns on the films. The results were compared with theoretical calculations of near-field distributions, and the observations revealed that the deformation patterns were dependent on the ratio between Ex and Ey wherein each possessed a different field distribution.