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Fig. 4 | Nanoscale Research Letters

Fig. 4

From: Effect of Surface Scattering of Electrons on Ratios of Optical Absorption and Scattering to Extinction of Gold Nanoshell

Fig. 4

Comparisons between measured and calculated absorption spectrums with and without consideration of surface scattering of conduction electrons. All calculations are carried out by Mie theory. The surrounding medium is PVA (polyvinyl alcohol) having a refractive index of 1.5. Note that the surrounding medium of nanoshells in our experiment (PVA, n = 1.5) is different from that in the characterization sheet provided in the supporting information, which is water. The surfactants coating the nanoshells can be neglected because the surfactants are thin polymer and have similar refractive index as the surrounding medium of PVA. The refractive index of silica is assumed to be 1.45 in the calculations. Gold’s dielectric constants without surface scattering are from reference [38], while those with surface scattering are given by Eqs. (1) and (4). In all figure legends, “Ext” is short for extinction, “Abs” is short for absorption, and “SC” is short for surface scattering. In each figure, “Ext calculated” and “Abs calculated with SC” are the extinction and absorption spectrums calculated with the fitting parameters shown in Table 2, while “Abs calculated without SC” is the absorption cross section calculated without considering size distribution and surface scattering. a (80-nm-diameter silica core)@(16-nm-thick gold shell). b (79-nm-diameter silica core)@(29-nm-thick gold shell). c (88-nm-diameter silica core)@(36-nm-thick gold shell)

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