Accuracy of the Skin Depth Correction for Metallic Nanoparticle Polarizability
Accuracy of the Skin Depth Correction for Metallic Nanoparticle Polarizability
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DOI：
10.1021/acs.jpcc.9b01672
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发表时间：
2019-05-23
影响因子：
3.7
通讯作者：
McLeod, Euan
中科院分区：
文献类型：
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作者：
Liu, Weilin;McLeod, Euan
偶极近似通常用于计算作用在纳米颗粒上的光散射和光学力。散射场强与粒子体积成正比。在过去的三十年里，许多研究人员在处理金属纳米颗粒时使用基于趋肤深度的有效体积，而不是完整体积。通过比较几个偶极子模型米氏散射和时域有限差分模拟，我们表明，它是更准确地使用全体积，因为复杂的相对介电常数的金属已经占其趋肤深度。
Dipole approximations are commonly used in calculations of light scattering and optical forces acting on nanoparticles. The scattered field strength is proportional to particle volume. For the past three decades, many researchers have used an effective volume based on skin depth when dealing with metallic nanoparticles, instead of the full volume. By comparing several dipole models to Mie scattering and finite difference time domain simulations, we show that it is more accurate to use the full volume because the complex relative permittivity of the metal already accounts for its skin depth.