基于磁场诱导周期性人工电磁结构材料自组装生长及光控特性研究

In this project, we propose a novel magnetic-field-induced self-assembly method to fabricate metamaterials and metasurfaces. We synthesize a magnetic core-shell plasmonic nanocavity system consisting of an Au nanorod core surrounded by a Co and Ni shell by van der Waals epitaxy. It is proposed to carry out systematic investigation on the effect of the shell thickness of Co and Ni on the plasmonic peak, magnetic and magneto-optical properties of the Au/Co and Au/Ni magnetic core-shell plasmonic nanocavities, which are parallelly aligned along the magnetic curve at the interface of air and liquid. It is anticipated that the proposed research are going to investigate the impacts of the intensity, direction and spatial distribution of magnetic field on the self-assembly orientation and gap of Au/Co and Au/Ni nanorods, and further deeply understand the influence of shell thickness, nanorod orientation and gap on the plasmonic optical properties, unusual reflection and refraction, magneto-optical properties of metamaterials and metasurfaces.

本项目提出了一种新型的磁场诱导磁性纳米棒自组装构建周期性人工电磁结构材料的方法。采用范德瓦尔斯外延生长法以Au纳米棒为核合成Au/Co、Au/Ni磁性纳米棒表面等离激元共振结构，系统研究Co、Ni壳层厚度与Au/Co、Au/Ni表面等离激元光学性能、磁性能、磁光性能的物理联系；利用周期性磁场诱导磁性纳米棒在气/液界面沿磁力线规则取向排列制备周期性人工电磁结构材料，建立周期性磁场方向、分布、强度与Au/磁性金属纳米棒排列取向、间距的关系，澄清Au/磁性金属纳米棒周期性结构的表面等离激元光学性能、异常反射/折射特性、磁光性能与排列方式、壳层厚度、壳层性质之间的物理联系。

本项目提出了一种新型的磁场诱导磁性纳米棒自组装的方法。采用Pt辅助法成功制备了Au/Co、Au/Ni、磁性金属核壳结构纳米棒结构，在可见光区实现了对表面等离激元共振峰的调控，并将其自组装成薄膜，表面等离激元效应增强了其法拉第旋光特性，在短程实现了周期性结构，但长程有序性有待提高。在本项目的支持下，以第一作者或通讯作者在ACS Nano、Nano. Lett.、Sci. China Mater.等国际学术期刊上发表论文9篇，6次获邀作特邀报告。

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