Calculations on the Optical Properties of Layered Metal Nanospheres
Calculations on the Optical Properties of Layered Metal Nanospheres
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层状金属纳米球光学性能的计算
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
K. Shuford
中科院分区：
文献类型：
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作者：
G. Schatz;K. Shuford
在该实验中，观察了几种球形纳米颗粒的光学性质。使用米氏理论对粒子进行建模，米氏理论是一组计算几乎任何球形粒子消光系数的方程。最初，该理论用于模拟由贵金属制成的固体颗粒。随着时间的推移，其范围扩大到对涂层纳米球和其他不同材料进行建模。我们试图在改变颗粒的成分、核尺寸和壳尺寸的同时观察颗粒之间的许多趋势。我们发现，通过巧妙地改变粒子的属性，我们可以显着改变它们的消光光谱。最后，我们尝试使用米氏理论对所谓的“耳语画廊模式”进行建模。该理论能够有效地预测它们的吸收和散射，但所使用的程序无法模拟大型、高吸收性的球体。
In this experiment, the optical properties of several spherical nanoparticles were observed. Particles were modeled using Mie theory, a set of equations that calculate the extinction coefficient of virtually any spherical particle. Initially this theory was used to model solid particles made of noble metals. As time passed, its scope was broadened to modeling coated nanospheres and other different materials. We attempted to observe many trends among the particles while changing their composition, core size, and shell size. We found that by subtly changing the attributes of the particles, we could significantly modify their extinction spectra. Finally, we attempted to model socalled “whispering-gallery modes” using Mie theory. The theory was able to predict their absorption and scattering effectively, but the programs employed were unable to model large, highly absorbing spheres.