【摘要】 用Mie理论和Maxwell Garnett(M G)理论对Ag,Cu单元素注入石英玻璃的吸收谱进行了模拟,得到了与实验结果一致的表面等离子体共振吸收峰.模拟结果显示,吸收峰来源于Ag和Cu注入石英玻璃后形成纳米颗粒的光吸收.假定Ag,Cu双元素注入石英玻璃后形成合金结构,M G理论模拟结果与实验吻合良好,说明形成合金结构的可能性很大.同时,用电子自由程理论对金属颗粒的介电函数进行了修正,给出了可以反映共振吸收峰的峰宽和强度随颗粒尺寸变化的模拟结果,为光开关的研究提供了一定的理论依据.更多还原

【Abstract】 Mie theory and Maxwell-Garnett (M-G) theory and their applications in calculating optical absorption were introduced in this paper. Theoretical calculation gives the same surface plasma resonance (SPR) absorption peaks as that of the Ag and Cu ions implanted silica glasses, where Ag showed a SPR absorption peak at about 400 nm while Cu at 570 nm. By assuming that Ag-Cu alloy had been formed in Ag, Cu sequentially implanted samples, we exploited the M-G theory and obtained optical absorption spectra which indicate there is only a single surface plasmon resonance (SPR) peak at around 432 nm. These spectra obtained from M-G theory give identical results with previous experiments. Considering Electron Free Path effect, better simulation results, which could clearly show the relationship between the particle dimension and the FWHM of the spectra peaks had been obtained.更多还原