金属纳米颗粒光散射特性研究

发布时间：2018-06-04 06:45

本文选题：金属纳米颗粒 + 表面等离激元共振　；参考：《太阳能学报》2017年03期

【摘要】：采用基于有限元的数值模拟方法,建立微晶硅衬底上单个金属纳米颗粒与光相互作用的三维(3D)模型,分别计算不同半径的Ag、Al、Au和Cu球状纳米颗粒的散射截面、吸收截面、散射效率及耦合效率。结果表明:随着金属纳米球半径R的增大,表面等离激元偶极共振峰发生红移且展宽,同时颗粒的归一化吸收截面快速下降;在中长波段(500~1100 nm),颗粒的散射效率随R的增大而增大,但耦合效率则呈现单调下降趋势。在相同尺寸的Ag、Al、Au和Cu颗粒中,Au和Cu的吸收截面较大,当R=50 nm时,Au和Cu颗粒的吸收截面甚至大于其散射截面,二者在中短波段(300~550 nm)的散射效率明显偏低。另外,金属纳米颗粒的耦合效率对颗粒成分变化不敏感。
[Abstract]:A three-dimensional (3D) model of the interaction between single metal nanoparticles and light on microcrystalline silicon substrates was established by using finite element method. The scattering cross sections and absorption sections of AgPe Alan au and Cu spherical nanoparticles with different radii were calculated, respectively. Scattering efficiency and coupling efficiency. The results show that with the increase of the radius R of the metal nanoparticles, the resonance peak of the surface isobaric dipole is red-shifted and widened, and the normalized absorption cross section of the particles decreases rapidly. The scattering efficiency of the particles increases with the increase of R, but the coupling efficiency decreases monotonously at the medium and long wavelength band of 500 ~ 1100 nm ~ (-1). The absorption cross sections of au and Cu are larger in the same size of Agar Aln au and Cu particles, and the absorption cross sections of au and Cu particles are even larger than their scattering cross sections at 50 nm, and the scattering efficiency of the two particles is obviously lower in the medium and short band (300 ~ 550 nm). In addition, the coupling efficiency of metal nanoparticles is insensitive to the change of particle composition.
【作者单位】：郑州大学物理工程学院材料物理教育部重点实验室;
【基金】：国家重点基础研究发展(973)计划(2011CB201606) 国家自然科学基金(11204276)
【分类号】：TB383.1;TM914.4

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