DOI: https://doi.org/10.30970/jps.23.2603
OPTICAL ABSORPTION OF COMPOSITE WITH BILAYER NANOPARTICLES
A. V. Korotun, A. O. Koval', V. I. Reva
Zaporizhia National Technical University, Zhukovsky Str. 64, 69063 Zaporizhia, Ukraine
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Journal of Physical Studies 23(2), Article 2603 [5 pages] (2019)
DOI: https://doi.org/10.30970/jps.23.2603 OPTICAL ABSORPTION OF COMPOSITE WITH BILAYER NANOPARTICLESA. V. Korotun, A. O. Koval', V. I. Reva Zaporizhia National Technical University, Zhukovsky Str. 64, 69063 Zaporizhia, Ukraine |
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Investigation of the optical properties of metal-oxide nanoparticle composites is of vital interest as a result of their extensive use in engineering. The optical characteristics of such a composite differ significantly from those of metal nanoparticles and matrix. In addition, there is a significant difference between the theoretical and experimental results for the magnitude of absorption in the far infrared range.
In this work, the optical absorption of the composite ``dielectric-two-layer nanoparticle'' is analyzed, which is a metal ball coated with a layer of oxide and placed in a dielectric medium. Approximate formulas are obtained for the case of a metallic nanoparticle covered with a thin layer of oxide. The absorption coefficient of the nanocomposite is calculated for Argentum particles of different radii with different thickness of the oxide layer, which are in different matrices. Calculations are made for the case when the effective relaxation time depends on the geometric dimensions of the two-layer nanoparticle. It has been shown that with a decrease of the particle radius there is an increase in the contribution of the surface scattering. It has been shown that a composite with nanoparticles of smaller sizes and with a larger thickness of the oxide layer absorbs electromagnetic radiation better. It has been established that an increase in the dielectric constant of the matrix leads to a decrease in the absorption coefficient, which is due to the weakening of the interaction of the electromagnetic wave with the conduction electrons of the metal core.
PACS number(s): 62.23.Pq, 78.67.An