Аbsorption of diffuse light by 2D arrays of spherical particles

The light absorption and scattering by an infinite two-dimensional array with an imperfect lattice of identical spherical particles is considered based on the statistical approach to a description of electromagnetic wave interaction with particulate media. Absorption resonances due to the coherent component of scattered light (zeroth order of diffraction) and resonances arising from the excitation of a flux of incoherently scattered light (higher diffraction orders) propagating at grazing angles to the array plane are studied. The dependence of absorption on the degree of positional ordering of particles is considered. It is shown that with an increase in ordering, the spatial coherence of the light flux along the array plane increases and the absorption resonance becomes more pronounced. Data are presented for silver wavelength-sized particles for s - and p -polarized incident waves. It is shown that at small angles of incidence, the first diffraction order can arise at the wavelength of zeroth-order resonance. In this case, the contributions to absorption created by the coherent and incoherent components of scattered light are summed up. The value of the absorption coefficient can be close to 0.95. A comparison with data for a partially ordered array is carried out.

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Optical characteristics of a monolayer of identical spherical particles in an absorbing host medium

Loĭko

Miskevich

Loiko

2023

J. Opt. Soc. Am. A

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The problem of light interaction with a 2D ensemble of homogeneous spherical particles embedded into an unbounded homogeneous absorbing host medium is considered. Based on the statistical approach, the equations are derived to characterize optical response of such a system with taking into account multiple scattering of light. Numerical data are presented for the spectral behavior of coherent transmission and reflection, incoherent scattering, and absorption coefficients of thin dielectric, semiconductor, and metal films containing a monolayer of particles with various spatial organization. The results are compared with the characteristics of the inverse structure: particles consist of the host medium material and vice versa. Data for the redshift of the surface plasmon resonance of the monolayer of gold (Au) nanoparticles in the fullerene (C60) matrix are presented as a function of the monolayer filling factor. They are in qualitative agreement with the known experimental results. The findings have potential applications in the development of new electro-optical and photonic devices.

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Аbsorption of diffuse light by 2D arrays of spherical particles

Cited by 4 publications

References 34 publications

Optical Response of a Composite System “Monolayer of Spherical Particles in an Absorbing Matrix” at Normal Incidence of Plane Wave

Optical Response of a Composite System “Monolayer of Spherical Particles in an Absorbing Matrix” at Normal Incidence of Plane Wave

Resonant absorption of light by a two-dimensional imperfect lattice of spherical particles

Optical characteristics of a monolayer of identical spherical particles in an absorbing host medium

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