The scattering of light by a suspension of coated spherical particles: effects of polydispersity on cross sections
نویسنده
چکیده
The effect of polydispersity on extinction cross sections is studied for a particle system composed of coated, spherical particles. Aden–Kerker equations, governing the light-scattering behaviour of the system, are formulated in a way that makes them more suitable for computation purposes. Differences found between light scattered by non-absorbing and highly absorbing particles show the importance of using accurate refractive indices, especially when dealing with their imaginary part, which accounts for absorption.
منابع مشابه
A Computer Modeling of Mie-Scattering by Spherical Droplets Within the Atmosphere
The Earth’s atmosphere is an environment replete with particles of differ-ent sizes with various refractive indices which affect the light radiation traveling through it. The Mie scattering theory is one of the well-known light scattering techniques ap-plicable to modeling of electromagnetic scattering from tiny atmospheric particles or aerosols floating in the air or within the clouds. In this...
متن کاملDetermination of the size distribution of monodesperse and bidisperse mixtures of spherical particles in the nanometer and submicron size range by applying cumulant analysis and contin algorithm in dynamic light scattering
Determination of particle size is one of the major needs in the industry and biotechnology. Dynamic light scattering (DLS) is a widely used technique for determining size distribution of spherical particle in nanometer and submicron size range. In this method, there are different algorithms for determining the size and size distribution of particles, which are selected according to the required...
متن کاملMultiple Light Scattering by Spherical Particle Systems and Its Dependence on Concentration: A T-Matrix Study.
The T-matrix method has been used to calculate scattering cross-sections of two spherical particles close to each other. By comparing our results with those expected for infinite distance, we can determine the maximum distance required to produce interparticle light-scattering interactions. As a result, we can determine the degree of dilution needed in a particle suspension to remain within the...
متن کاملTheoretical Analysis of the Optical Properties of Gold Nanoparticles Using DDA Approximation
This article describes a study, using numerical simulation, of the optical properties of nano particles as a function of their size. Many methods introduced to simulate and calculate the interaction of light and particle, such as Mie analysis, boundary element and finite element methods. The Discrete Dipole Approximation (DDA), wherein a target geometry is modeled as a ...
متن کاملHuge light scattering from active anisotropic spherical particles.
The light scattering by a spherical particle with radial anisotropic permittivity ε and permeability μ are discussed in detail by expanding Mie theory. With the modified vector potential formulation, the electric anisotropy effects on scattering efficiency are addressed by studying the extinction, scattering, absorption and radar cross sections following the change of the transverse permittivit...
متن کامل