Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA.
J Chem Phys. 2011 Mar 28;134(12):124312. doi: 10.1063/1.3570827.
We describe surface-enhanced Raman scattering measurements from a benzenethiol monolayer adsorbed on a silver-coated film that is, in turn, deposited on an artificial opal, where the latter is a close-packed three-dimensional dielectric lattice formed from polystyrene spheres. Data for a range of sphere sizes, silver film thicknesses, and laser excitation wavelengths are obtained. Enhancement factors can be in the range of 10(7). To partially explain these large enhancements, we have performed model finite-difference time domain simulations of the position-dependent electric fields generated at the opal surfaces for several experimentally studied laser wavelengths and sphere diameters.
我们描述了吸附在银镀膜上的苯硫醇单层的表面增强拉曼散射测量，该银镀膜又沉积在人造蛋白石上，后者是由聚苯乙烯球形成的密堆积三维介电晶格。获得了一系列球体尺寸、银膜厚度和激光激发波长的数据。增强因子可以在 10（7）的范围内。为了部分解释这些大的增强，我们对蛋白石表面产生的随位置变化的电场进行了模型有限差分时间域模拟，这些模拟考虑了几个实验研究的激光波长和球体直径。
