新型金属微纳结构的设计、制备及其应用研究
发布时间：2019-03-25 07:09
【摘要】：金属微纳结构由于其独特的光学性质,引起了国内外学者的研究热潮。这些结构的光学性质通常都与表面等离激元密切相关,通过对金属微纳结构的适当设计,我们可以在纳米尺度上对光学性质进行“修饰”,因此设计与制备新颖的金属微纳结构具有重大的意义。本文围绕新型金属微纳结构的设计、制备及其应用展开了深入的研究,论文内容主要包括以下两个方面:一、利用基于有限元方法的Comsol Multiphysics商业计算软件,我们理论研究了置于衬底中的金属纳米颗粒构成的二维周期性阵列中局域表面等离激元(LSP)共振通过远场耦合产生的Fano共振现象。研究结果表明,要实现金属纳米颗粒周期阵列中的Fano共振,必须同时具备以下三个条件:(1)阵列周期产生的衍射表面波与金属纳米颗粒LSP共振的位置要接近;(2)金属纳米颗粒周期阵列必须处于均匀的环境媒质中;(3)衍射表面波与金属纳米颗粒LSP共振这两种不同线宽的模式必须具有相同的电场分量;当Fano共振模被激发时,其局域电场增强能达到单个纳米颗粒LSP共振的110倍。这种杂化Fano共振模具有较窄的带宽及显著增强的电场,在高效生物传感、表面增强拉曼散射、光学开关、光学调制及非线性光子学等领域中有着潜在的应用前景。二、利用胶体晶体辅助的纳米球刻印、反应离子刻蚀及磁控溅射技术,我们制备了间距可控的三角金属纳米颗粒周期阵列,对制备的样品进行了光学表征,表征结果显示随着反应离子刻蚀时间的增加,三角金属纳米颗粒周期阵列中颗粒间的间距会逐渐减小,从而使金属纳米颗粒间的电场得到显著的增强;进而实验研究了所制备的不同间距的金属微纳结构的表面增强拉曼散射效应,实验结果表明拉曼信号的增强效果与金属纳米颗粒间的间距大小密切相关,拉曼信号的强度随着纳米颗粒间间距的减少而显著地增强。我们制备的这种三角金属纳米颗粒周期阵列颗粒间距可调控、制备面积大,在表面拉曼散射增强领域中有着广阔的应用前景。
[Abstract]:Due to its unique optical properties, metal micro / nano structures have attracted much attention from scholars at home and abroad. The optical properties of these structures are usually closely related to the surface plasmon. Through the proper design of metal micro / nano structures, we can "modify" the optical properties at the nanometer scale. Therefore, it is of great significance to design and fabricate novel metal micro / nano structures. This paper focuses on the design, fabrication and application of new metal micro / nano structures. The main contents of this thesis are as follows: first, the Comsol Multiphysics commercial computing software based on finite element method is used, and the main contents of this paper are as follows: 1. We theoretically study the phenomenon of (LSP) resonance produced by far-field coupling in a two-dimensional periodic array consisting of metal nanoparticles on the substrate. The local surface plasmon Fano resonance is generated by the far-field coupling. The results show that in order to realize the Fano resonance in the periodic array of metal nanoparticles, the following three conditions must be met simultaneously: (1) the position of the diffraction surface wave generated by the array period is close to that of the LSP resonance of the metal nanoparticles; (2) the periodic array of metal nanoparticles must be in uniform environmental medium, (3) the two modes with different linewidth of diffracted surface wave and LSP resonance of metal nanoparticles must have the same electric field component; When the Fano resonance mode is excited, the local electric field enhancement energy is 110 times that of the single nano-particle LSP resonance. The hybrid Fano resonant mode has narrow bandwidth and significantly enhanced electric field, and has potential applications in the fields of high efficiency biosensor, surface-enhanced Raman scattering, optical switch, optical modulation and nonlinear photonics. Secondly, using colloidal crystal assisted nanospheres etching, reactive ion etching and magnetron sputtering techniques, we fabricated periodic arrays of triangular metal nanoparticles with controllable spacing, and the samples were characterized by optics. The characterization results show that with the increase of etching time, the spacing between particles in the periodic array of triangular metal nanoparticles decreases gradually, which makes the electric field between metal nanoparticles significantly enhanced. The surface-enhanced Raman scattering effect of metal micro-nano structures with different spacing has been studied experimentally. The experimental results show that the enhancement effect of Raman signal is closely related to the spacing between metal nanoparticles. The intensity of Raman signal increases significantly with the decrease of the spacing between nanoparticles. The periodic array of triangular metal nanoparticles prepared by us has a wide application prospect in the field of surface Raman scattering enhancement due to its controllable particle spacing and large fabrication area.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1
[Abstract]:Due to its unique optical properties, metal micro / nano structures have attracted much attention from scholars at home and abroad. The optical properties of these structures are usually closely related to the surface plasmon. Through the proper design of metal micro / nano structures, we can "modify" the optical properties at the nanometer scale. Therefore, it is of great significance to design and fabricate novel metal micro / nano structures. This paper focuses on the design, fabrication and application of new metal micro / nano structures. The main contents of this thesis are as follows: first, the Comsol Multiphysics commercial computing software based on finite element method is used, and the main contents of this paper are as follows: 1. We theoretically study the phenomenon of (LSP) resonance produced by far-field coupling in a two-dimensional periodic array consisting of metal nanoparticles on the substrate. The local surface plasmon Fano resonance is generated by the far-field coupling. The results show that in order to realize the Fano resonance in the periodic array of metal nanoparticles, the following three conditions must be met simultaneously: (1) the position of the diffraction surface wave generated by the array period is close to that of the LSP resonance of the metal nanoparticles; (2) the periodic array of metal nanoparticles must be in uniform environmental medium, (3) the two modes with different linewidth of diffracted surface wave and LSP resonance of metal nanoparticles must have the same electric field component; When the Fano resonance mode is excited, the local electric field enhancement energy is 110 times that of the single nano-particle LSP resonance. The hybrid Fano resonant mode has narrow bandwidth and significantly enhanced electric field, and has potential applications in the fields of high efficiency biosensor, surface-enhanced Raman scattering, optical switch, optical modulation and nonlinear photonics. Secondly, using colloidal crystal assisted nanospheres etching, reactive ion etching and magnetron sputtering techniques, we fabricated periodic arrays of triangular metal nanoparticles with controllable spacing, and the samples were characterized by optics. The characterization results show that with the increase of etching time, the spacing between particles in the periodic array of triangular metal nanoparticles decreases gradually, which makes the electric field between metal nanoparticles significantly enhanced. The surface-enhanced Raman scattering effect of metal micro-nano structures with different spacing has been studied experimentally. The experimental results show that the enhancement effect of Raman signal is closely related to the spacing between metal nanoparticles. The intensity of Raman signal increases significantly with the decrease of the spacing between nanoparticles. The periodic array of triangular metal nanoparticles prepared by us has a wide application prospect in the field of surface Raman scattering enhancement due to its controllable particle spacing and large fabrication area.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1
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