Electrodeposition of Au meso-particles on anodized and chemically etched Al-Cu films deposited on Si wafers proceeds by instantaneous nucleation and with no diffusion limitations. Both of these phenomena favor the formation of relatively mono-dispersed Au particles. The mean particle diameter varies a function of electrodeposition time in the range of 40-80 nm. Optical constants of Au meso-particles are determined by spectroscopic ellipsometry. A two layer optical model is suggested to determine both extinction coefficients and refractive indexes of Au meso-particles as a function of the mean particle diameter. The absorption peak, associated with surface plasmons, is modeled with two Lorentz oscillators. The maximum of extinction coefficient shifts from 610 to 675 nm as the mean particle diameter increases from 42 to 74 nm.
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机译：阳极氧化和化学蚀刻的Al-Cu膜上的Au Meso-颗粒的电沉积通过瞬时成核来进行沉积在Si晶片上，没有扩散限制。这两种现象都赞成形成相对单分散的Au颗粒。平均粒径在40-80nm的范围内变化电沉积时间的函数。 Au Meso-颗粒的光学常数由光谱椭圆形测定法测定。建议使用两层光学模型以确定Au Meso-颗粒的消光系数和折射率作为平均粒径的函数。与表面等离子体相关的吸收峰是用两个洛伦兹振荡器建模的。由于平均粒径从42至74nm增加，消光系数从610转移到675nm。
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