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arXiv 1304.2160cond-mat.mes-hall
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球形金属纳米粒子等离子体共振的温度依赖性

Temperature dependence of plasmon resonances in spheroidal metal nanoparticles

N. I. Grigorchuk

摘要:

在动力学理论的框架下,研究了电子温度对金属纳米粒子(MN)在表面等离子体电子振动激发下的光吸收和散射的影响.导出了有限温度下电子气的电导率和极化率张量的计算公式。详细研究了球形MN的电导率和表面等离子体共振的半宽度。根据MN的尺寸,光吸收和散射的效率随温度的变化进行了研究。特别地,发现吸收效率可以随着温度下降而增加和减少。推导出的公式使它能够解析计算各种光学和输运现象的MN嵌入在任何介质中的任何球形形状。

英文摘要:

The effect of the electron temperature on both the light absorption and the scattering by metal nanoparticles (MNs) with excitation of the surface plasmon electron vibrations is studied in the framework of the kinetic theory. The formulae for electroconductivity and polarizability tensors are derived for finite temperatures of an electron gas. The electrical conductivity and the halfwidth of the surface plasmon resonance are studied in detail for a spherical MN. Depending on the size of MN, the efficiencies of light absorption and scattering with the temperature change are investigated. It is found, in particular, that the absorption efficiency can both increase and decrease with a temperature drop. The derived formulas make it possible to analytically calculate various optical and transport phenomena for MNs of any spheroidal shape embedded in any dielectric media.

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