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Optical Absorption of a Composite Based on Bilayer Metal–Dielectric Spherical Nanoparticles
Journal of Applied Spectroscopy ( IF 0.7 ) Pub Date : 2020-05-20 , DOI: 10.1007/s10812-020-00991-7
A. V. Korotun , A. A. Koval’ , I. N. Titov

Optical properties of core–shell (metal) nanoparticles and composites based on them were investigated in the classical approximation. Frequency dependences of the real and imaginary parts of the dielectric permittivity of bilayer particles and absorption coefficients of composites based on them were calculated. Small-scale oscillations of the real and imaginary parts of the dielectric permittivity and absorption coefficient were found in the low-frequency spectral region. The behavior of the dielectric permittivity of bilayer nanoparticles was analyzed for the limiting cases of thin and thick shells. The influence of the effective mean free pathlength of electrons on the optical characteristics of the bilayer nanoparticles was considered. Two maxima of the composite absorption coefficient were demonstrated to be due to hybridization of polar modes.

中文翻译:

基于双层金属-介电球形纳米粒子的复合材料的光吸收

用经典近似方法研究了核-壳(金属)纳米颗粒和基于它们的复合材料的光学性质。计算了双层颗粒介电常数的实部和虚部的频率依赖性以及基于它们的复合材料的吸收系数。在低频频谱区域中发现介电常数和吸收系数的实部和虚部的小规模振荡。对于薄壳和厚壳的极限情况,分析了双层纳米颗粒的介电常数行为。考虑了电子的有效平均自由程长度对双层纳米颗粒的光学特性的影响。复合吸收系数的两个最大值被证明是由于极性模式的杂交。
更新日期:2020-05-20
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