Reducing shape errors in the discrete dipole approximation using effective media

Name: Reducing shape errors in the discrete dipole approximation using effective media
Author: Zhu, Y., Liu, C., Yurkin, Maxim A.

İsim	Reducing shape errors in the discrete dipole approximation using effective media
Yazar	Zhu, Y., Liu, C., Yurkin, Maxim A.
Basım Tarihi:	2023-12-18
Basım Yeri	- Optica Publishing Group
Tür	Süreli Yayın
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	1094-4087
Kayıt Numarası	15d8bfec-433d-4d9b-91dd-b7afbe10b24d
Tarih	2023-12-18
Notlar	National Natural Science Foundation of China ; Nanjing University of Information Science and Technology ; Graduate Research and Innovation Projects of Jiangsu Province
Örnek Metin	The discrete dipole approximation (DDA) simulates optical properties of particles with any given shape based on the volume discretization. These calculations cost a large amount of time and memory to achieve high accuracy, especially for particles with large sizes and complex geometric structures, such as mixed black-carbon aerosol particles. We systematically study the smoothing of the DDA discretization using the effective medium approximation (EMA) for boundary dipoles. This approach is tested for optical simulations of spheres and coated black-carbon (BC) aggregates, using the Lorenz-Mie and multiple-sphere T-Matrix as references. For spheres, EMA significantly improves the DDA accuracy of integral scattering quantities (up to 60 times), when the dipole size is only several times smaller than the sphere diameter. In these cases, the application of the EMA is often comparable to halving the dipole size in the original DDA, thus reducing the simulation time by about an order of magnitude for the same accuracy. For a coated BC model based on transmission electron microscope observations, the EMA (specifically, the Maxwell Garnett variant) significantly improves the accuracy when the dipole size is larger than ¼ of the monomer diameter. For instance, the relative error of extinction efficiency is reduced from 4.7% to 0.3% when the dipole size equals that of the spherical monomer. Moreover, the EMA-DDA achieves the accuracy of 1% for extinction, absorption, and scattering efficiencies using three times larger dipoles than that with the original DDA, corresponding to about 30 times faster simulations.
DOI	10.1364/OE.509479
Cilt	31

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Reducing shape errors in the discrete dipole approximation using effective media

Yazar Zhu, Y., Liu, C., Yurkin, Maxim A.

Basım Tarihi 2023-12-18

Basım Yeri - Optica Publishing Group

Tür Süreli Yayın

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 1094-4087

Kayıt Numarası 15d8bfec-433d-4d9b-91dd-b7afbe10b24d

Tarih 2023-12-18

Notlar National Natural Science Foundation of China ; Nanjing University of Information Science and Technology ; Graduate Research and Innovation Projects of Jiangsu Province

Örnek Metin The discrete dipole approximation (DDA) simulates optical properties of particles with any given shape based on the volume discretization. These calculations cost a large amount of time and memory to achieve high accuracy, especially for particles with large sizes and complex geometric structures, such as mixed black-carbon aerosol particles. We systematically study the smoothing of the DDA discretization using the effective medium approximation (EMA) for boundary dipoles. This approach is tested for optical simulations of spheres and coated black-carbon (BC) aggregates, using the Lorenz-Mie and multiple-sphere T-Matrix as references. For spheres, EMA significantly improves the DDA accuracy of integral scattering quantities (up to 60 times), when the dipole size is only several times smaller than the sphere diameter. In these cases, the application of the EMA is often comparable to halving the dipole size in the original DDA, thus reducing the simulation time by about an order of magnitude for the same accuracy. For a coated BC model based on transmission electron microscope observations, the EMA (specifically, the Maxwell Garnett variant) significantly improves the accuracy when the dipole size is larger than ¼ of the monomer diameter. For instance, the relative error of extinction efficiency is reduced from 4.7% to 0.3% when the dipole size equals that of the spherical monomer. Moreover, the EMA-DDA achieves the accuracy of 1% for extinction, absorption, and scattering efficiencies using three times larger dipoles than that with the original DDA, corresponding to about 30 times faster simulations.

DOI 10.1364/OE.509479

Cilt 31