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基于Maxwell—Garnett(M-G)有效介质理论,建立了研究金属纳米不连续薄膜光学性质的理论模型,对半球形纳米颗粒在等效薄膜中的体积分数和纳米尺度效应提出修正处理;给出了可见光区附近Au纳米颗粒等效薄膜的有效相对电容率和光学常数随波长变化的结果,并获得薄膜的光反射率、透射率和吸收率随膜纳米尺度的变化谱。计算结果表明,金属纳米等效薄膜有效电容率和光学常数随纳米尺度增大而增大,谱峰出现很小的红移。进一步发现,纳米尺度越小,光的反射率和吸收率越小,但透射率越大,峰值位置随纳米尺度增大有小量红移,结果与实验相符。
Based on the theory of Maxwell-Garnett (MG) effective medium, a theoretical model for studying the optical properties of discontinuous nanostructured films has been established, and the correction of the volume fractions and nanoscale effects of the semispherical nanoparticles in an equivalent film has been proposed. Visible light The relative permittivity and optical constants of the Au nanoparticles equivalent films in the vicinity of the region change with the wavelength, and the light reflectance, transmittance and absorbance of the films are obtained according to the nanoscale spectra. The calculated results show that the effective permittivity and optical constants increase with the increase of nanometer scale, and there is a small redshift of the peak. It is further found that the smaller the nanoscale, the lower the light reflectance and absorption, but the greater the transmittance, the smaller the peak position with the increase of the nanoscale with a small amount of redshift. The result is consistent with the experiment.