Finite-difference analysis of plasmon-induced forces of metal nano-clusters by the Lorentz force formulation.
Finite-difference analysis of plasmon-induced forces of metal nano-clusters by the Lorentz force formulation.
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DOI：
10.1364/oe.18.027731
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发表时间：
2010-12
期刊：
影响因子：
3.8
通讯作者：
M. Fujii
中科院分区：
文献类型：
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作者：
M. Fujii
采用三维有限差分法，结合洛伦兹力公式，分析了金属纳米球上的光诱导力。通过积分金属纳米粒子体积上的洛伦兹力和库仑力，实现了对金属纳米粒子团簇作用力的收敛分析。通过与金属球在平面波光照射下的Mie辐射压力理论的比较，严格验证了数值方法的准确性。我们还分析了近距离的两个单独的金属球体，并将诱导力的结果与以前的出版物进行了比较。这种方法可以分析各种不规则结构上的力；我们将该方法应用于接触金属球体的简单团簇，在接触点上形成一个简单的团簇，分析团簇的等离子体共振引起的力。我们发现，当球体接触时，在红外范围内新出现的基共振模在团簇内表现出很强的结合力。在数值分析的基础上，我们识别了金属纳米球团簇的共振模式，并对红外感应力进行了定量评估。
We analyze light-induced forces on metal nano-spheres by using the three-dimensional finite-difference time-domain method with the Lorentz force formulation. Convergent analysis of the force on metal nano-particle clusters has been achieved by integrating the Lorentz and the Coulomb forces over the volume of the metal particles. Comparison to the Mie theory of radiation pressure on metal spheres under a plane wave illumination has verified rigorously the accuracy of the numerical method. We also analyze separate two metal spheres in close proximity and the results of the induced forces are compared to those in previous publications. The present method allows analysis of forces on various irregular structures; we apply the method to touching metal spheres, forming a simple cluster with a slight deformation at the contact point, to analyze the forces induced by the plasmonic resonance of the clusters. We show that the fundamental resonance modes, which newly appear in an infrared range when spheres are touching, exhibit strong binding forces within the clusters. Based on the numerical analyses we identify the resonance modes and evaluate quantitatively the infrared-induced forces on metal nano-sphere clusters.