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Al2O3介质薄膜与纳米Ag颗粒构成的复合结构,被应用于表面增强Raman散射探测实验中,其中Al2O3介质薄膜对纳米Ag颗粒的吸收谱及增强Raman散射光谱的影响被特别关注.该复合结构的光学特性表征出纳米Ag颗粒的偶极振荡特性.从光吸收谱中可以看到,其共振吸收谱随Al2O3介质薄膜厚度增加而在整个谱域上发生红移,表明纳米Ag颗粒的周围介电常数随Al2O3介质薄膜厚度的增加而增大.采用罗丹明6G作为探针原子,6个Raman特征峰的平均增益值作为表征表面增强Raman散射衬底增益程度的量度.实验结果表明,Al2O3介质薄膜层的引入提高了纳米Ag颗粒的衬底介电常数,并引起了散射共振的增强,从而使表面增强Raman散射强度提高.
Al2O3 composite thin films and nano-Ag particles composite structure, was used in surface-enhanced Raman scattering detection experiments, in which Al2O3 dielectric thin film on the absorption of nano-Ag particles and enhanced Raman scattering spectra with particular attention to the composite structure of the optical The characteristics of dipolar oscillation of nano-Ag particles are characterized.As can be seen from the light absorption spectrum, the resonance absorption spectrum of the nano-Ag particle redshifts over the whole spectrum with the increase of the thickness of the Al2O3 film, indicating that the surrounding dielectric constant With the increase of the thickness of the Al2O3 film.With Rhodamine 6G as the probe atom, the average gain of the six Raman peaks is a measure of the gain of the surface-enhanced Raman scattering substrate.The experimental results show that the Al2O3 dielectric thin film layer The introduction of nano Ag particles increases the dielectric constant of the substrate and causes the enhancement of the scattering resonance, so that the surface enhanced Raman scattering intensity is improved.