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首页> 外文期刊>Engineering analysis with boundary elements >Analysis of the surface plasmon resonance of a single core-shelled nanocomposite by surface integral equations
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Analysis of the surface plasmon resonance of a single core-shelled nanocomposite by surface integral equations

机译：用表面积分方程分析单个核壳纳米复合材料的表面等离子体共振

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To investigate the interactions of an illuminating light with a single nanocomposite (a core-shelled nanoparticle) in the range of ultraviolet (UV) to near infrared (NIR), a set of new surface integral equations was derived from the Stratton-Chu formulation of Maxwell's equations for a two-dimensional TM-mode problem. These integral equations belong to Fredholm equations of the second kind. Using the boundary-element method (BEM), these equations are solved to obtain the surface components (the tangential magnetic field, the normal displacement field and the tangential electric field) along the multi-connected interfaces (host/shell and shell/core) simultaneously. Two main structures of the core-shelled nanocomposite are studied by BEM; one is a nanoparticle of metallic core (Au or Ag) with an oxide shell (SiO_2 or ZrO_2), and the other structure is a silica core (SiO_2) with a metallic shell (e.g. Au or Ag). The numerical results illustrate a red-shift effect on the surface plasmon resonance (SPR) of the former structure can be induced by covering a high-permittivity shell on a metallic nanoparticle. For the latter, the red shift of SPR is caused by thinning the thickness of the metallic shell. This is to say by tuning the compositions and the configurations of the nanocomposites, the peak position and the linewidth of the SPR can be manipulated on demand.
机译：为了研究照明光与紫外（UV）到近红外（NIR）范围内的单个纳米复合物（核壳纳米粒子）的相互作用，从Stratton-Chu公式推导了一组新的表面积分方程。二维TM模式问题的麦克斯韦方程。这些积分方程属于第二类Fredholm方程。使用边界元法（BEM）求解这些方程，以获得沿多重连接界面（主体/壳和壳/核）的表面分量（切向磁场，法向位移场和切向电场）同时。 BEM研究了核壳型纳米复合材料的两个主要结构。一个是具有氧化壳（SiO_2或ZrO_2）的金属核（Au或Ag）的纳米粒子，另一个结构是具有金属壳（例如Au或Ag）的二氧化硅核（SiO_2）。数值结果表明，通过在金属纳米粒子上覆盖高介电常数的壳层，可以对前一种结构的表面等离子体共振（SPR）产生红移效应。对于后者，SPR的红移是由金属外壳厚度变薄引起的。也就是说，通过调节纳米复合材料的组成和构型，可以根据需要控制SPR的峰位置和线宽。

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