Absorption of nonpolarized light by a two-dimensional ensemble of spherical silver particles under oblique illumination
https://doi.org/10.29235/1561-2430-2022-58-2-221-230
Abstract
The problem of absorption of nonpolarized (natural) light by a two-dimensional ensemble (monolayer) of spherical particles under oblique illumination is considered. The solution is based on the statistical theory of multiple scatteing of waves. The written equations make it possible to find the optimal conditions for the absorption of directed light to increase the absorption efficiency of monolayers with a periodic and partially ordered spatial arrangement of particles. The results of the calculations are presented for the absorption coefficient of polarized and natural light by ensembles of silver particles in a nonabsorbing medium. The particle size and monolayer filling factor are chosen so as to illustrate the dependence of absorption on the angle of incidence under conditions of resonance effects caused by the spatial organization of particles. It is shown that in the region of the resonant absorption peak a normally illuminated monolayer with a triangular lattice of silver particles can absorb almost an order of magnitude more incident light than a partially ordered layer. The absorption coefficient of a monolayer under directional oblique illumination can be almost an order of magnitude larger than under normal illumination. The results can be used to optimize the design of opto-electronic devices based on particulate layers.
Keywords
light absorption,
polarization of light,
spatially organized nano- and microstructures,
metasurfaces
Supporting agencies: This work was performed with the financial support of the Belarusian Republican Foundation for Fundamental Research (Grant № Ф20КИ-004). The authors are grateful to Professor N. A. Loiko for fruitful discussions.
About the Authors
V. A. Loiko
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
Valery A. Loiko – Dr. Sc. (Physics and Mathematics), Professor, Chief Researcher the Center for Optical Remote Sensing
68-2, Niezalezhnastsi Ave., 220072, Minsk
A. A. Miskevich
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
Alexander A. Miskevich – Ph. D. (Physics and Mathematics), Leading Researcher of the Center for Optical Remote Sensing
68-2, Niezalezhnastsi Ave., 220072, Minsk
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