Simulation of absorption and scattering spectra of crystalline organic nanoparticles with the discrete dipole approximation: Effects of crystal shape, crystal size, and refractive index of the medium

2021 ◽  
Vol 155 (16) ◽  
pp. 164703
Author(s):  
Freddy Zutterman ◽  
Benoît Champagne
Keyword(s):  
Refractive Index ◽  
Crystal Size ◽  
Dipole Approximation ◽  
Discrete Dipole Approximation ◽  
Crystal Shape ◽  
Organic Nanoparticles ◽  
Scattering Spectra

scholarly journals Using the DDA (Discrete Dipole Approximation) Method in Determining the Extinction Cross Section of Black Carbon

2015 ◽  
Vol 22 (1) ◽  
pp. 153-164 ◽  
Author(s):  
Krzysztof Skorupski
Keyword(s):  
Refractive Index ◽  
Black Carbon ◽  
Cross Section ◽  
Main Parameter ◽  
Complex Refractive Index ◽  
Dipole Approximation ◽  
Discrete Dipole Approximation ◽  
Extinction Cross Section ◽  
Quality Of Results

AbstractBC (Black Carbon), which can be found in the atmosphere, is characterized by a large value of the imaginary part of the complex refractive index and, therefore, might have an impact on the global warming effect. To study the interaction of BC with light often computer simulations are used. One of the methods, which are capable of performing light scattering simulations by any shape, is DDA (Discrete Dipole Approximation). In this work its accuracy was estimated in respect to BC structures using the latest stable version of the ADDA (vr. 1.2) algorithm. As the reference algorithm the GMM (Generalized Multiparticle Mie-Solution) code was used. The study shows that the number of volume elements (dipoles) is the main parameter that defines the quality of results. However, they can be improved by a proper polarizability expression. The most accurate, and least time consuming, simulations were observed for IGT_SO. When an aggregate consists of particles composed of ca. 750 volume elements (dipoles), the averaged relative extinction error should not exceed ca. 4.5%.

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