Finite-difference time-domain solution of light scattering by dielectric particles with a perfectly matched layer absorbing boundary condition

Sun, Wenbo; Fu, Qiang; Chen, Zhizhang

doi:10.1364/ao.38.003141

Cited by 158 publications

(85 citation statements)

References 51 publications

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“…Macke et al, 1996a, b;McFarquhar and Heymsfield, 1996;Yang et al, 2000Yang et al, , 2005Yang et al, , 2013Um and McFarquhar, 2007Nousiainen et al, 2011;Baum et al, 2005Baum et al, , 2011Baran and C.-Labonnote, 2007;Ishimoto et al, 2012b;Liu et al, 2014a). Numerous light-scattering computation methods have been employed to calculate the single-scattering properties of the various ice particles, including the finitedifference time-domain (FDTD) method (Yee, 1966;Yang and Liou, 1998a;Sun et al, 1999, Ishimoto et al, 2012a, the T-matrix (Baran et al, 2001;Bi and Yang, 2014a, b), the discrete dipole approximation method (Purcell and Pennypacker, 1973;Draine and Flatau, 1994;Yurkin et al, 2007), the boundary element method (Mano, 2000;Groth et al, 2015), the pseudo-spectral time-domain method (Liu, 1997(Liu, , 1998Chen et al, 2008;Liu et al, 2012), the surface-integral equation method (Nakajima et al, 2009), the improved geometric optics method (IGOM) (Yang and Liou, 1996), geometric optics integral equation (GOIE) (Yang and Liou, 1996;Ishimoto et al, 2012a), and the ray-tracing geometric optics method (GOM) Liou, 1989, 1993;Macke, 1993;Macke et al, 1996a;Yang and Liou, 1998b;Masuda et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Investigation of ice particle habits to be used for ice cloud remote sensing for the GCOM-C satellite mission

et al. 2016

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Abstract. In this study, various ice particle habits are investigated in conjunction with inferring the optical properties of ice clouds for use in the Global Change Observation Mission-Climate (GCOM-C) satellite programme. We develop a database of the single-scattering properties of five ice habit models: plates, columns, droxtals, bullet rosettes, and Voronoi. The database is based on the specification of the Second Generation Global Imager (SGLI) sensor on board the GCOM-C satellite, which is scheduled to be launched in 2017 by the Japan Aerospace Exploration Agency. A combination of the finite-difference time-domain method, the geometric optics integral equation technique, and the geometric optics method is applied to compute the single-scattering properties of the selected ice particle habits at 36 wavelengths, from the visible to the infrared spectral regions. This covers the SGLI channels for the size parameter, which is defined as a single-particle radius of an equivalent volume sphere, ranging between 6 and 9000 µm. The database includes the extinction efficiency, absorption efficiency, average geometrical cross section, single-scattering albedo, asymmetry factor, size parameter of a volume-equivalent sphere, maximum distance from the centre of mass, particle volume, and six nonzero elements of the scattering phase matrix. The characteristics of calculated extinction efficiency, single-scattering albedo, and asymmetry factor of the five ice particle habits are compared. Furthermore, sizeintegrated bulk scattering properties for the five ice particle habit models are calculated from the single-scattering database and microphysical data. Using the five ice particle habit models, the optical thickness and spherical albedo of ice clouds are retrieved from the Polarization and Directionality of the Earth's Reflectances-3 (POLDER-3) measurements, recorded on board the Polarization and Anisotropy of Reflectances for Atmospheric Sciences coupled with Observations from a Lidar (PARASOL) satellite. The optimal ice particle habit for retrieving the SGLI ice cloud properties is investigated by adopting the spherical albedo difference (SAD) method. It is found that the SAD is distributed stably due to the scattering angle increases for bullet rosettes with an effective diameter (D eff ) of 10 µm and Voronoi particles with D eff values of 10, 60, and 100 µm. It is confirmed that the SAD of small bullet-rosette particles and all sizes of Voronoi particles has a low angular dependence, indicating that a combination of the bullet-rosette and Voronoi models is sufficient for retrieval of the ice cloud's spherical albedo and optical thickness as effective habit models for the SGLI Published by Copernicus Publications on behalf of the European Geosciences Union. 12288H. Letu et al.: Investigation of ice particle habits to be used for ice cloud remote sensing sensor. Finally, SAD analysis based on the Voronoi habit model with moderate particle size (D eff = 60 µm) is compared with the conventional general habit mixture mode...

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Section: Introductionmentioning

confidence: 99%

Investigation of ice particle habits to be used for ice cloud remote sensing for the GCOM-C satellite mission

et al. 2016

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“…The conformal FDTD method on non-orthogonal grids [15][16][17], counter path FDTD method [18,19], and subgridding method [20][21][22] can represent curved interfaces suitably, but they are relatively difficult to implement and increase the memory and computation time. A different approach using effective permittivities (EPs), which derives from interface interpolations based on Ampere's and Faraday's integration laws, can reduce the error of the permittivity model on coarse grids in a simple implementation and at low computational cost [23][24][25][26][27][28][29][30][31][32][33][34][35]. The EP method, however, is not effective for plasmonic materials because the SP resonance condition is changed on interfaces due to interpolated values of EPs.…”

Section: Introductionmentioning

confidence: 99%

Effective Permittivity for FDTD Calculation of Plasmonic Materials

Okada

Cole

2012

Micromachines

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We present a new effective permittivity (EP) model to accurately calculate surface plasmons (SPs) using the finite-difference time-domain (FDTD) method. The computational representation of physical structures with curved interfaces causes inherent errors in FDTD calculations, especially when the numerical grid is coarse. Conventional EP models improve the errors, but they are not effective for SPs because the SP resonance condition determined by the original permittivity is changed by the interpolated EP values. We perform FDTD simulations using the proposed model for an infinitely-long silver cylinder and gold sphere, and the results are compared with Mie theory. Our model gives better accuracy than the conventional staircase and EP models for SPs.

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“…For example, the discrete-dipole approximation (DDA) method [7][8][9] simply cannot be applied for perfectly conducting particles, because of the zero inside fields. The finite-difference time-domain (FDTD) technique [10][11][12][13] can be applied to calculate the near fields scattered by the metallic particles; but also due to the zero inside fields, the volume integral transformation of near fields to far fields cannot be applied, whereas the virtualsurface integral transformation involves significant errors because of the FDTD errors in the forward-scattering near fields [14]. Therefore, an accurate calculation of light scattering by general scattering systems composed of nonspherical particles and involving multiple scattering will still be a challenging problem in the foreseeable future.…”

Section: Methodsmentioning

confidence: 99%

Optical characterization of metallic aerosols

Sun

Lin

2006

Journal of Quantitative Spectroscopy and Radiative Transfer

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Airborne metallic particulates from industry and urban sources are highly conducting aerosols. The characterization of these pollutant particles is important for environment monitoring and protection. Because these metallic particulates are highly reflective, their effect on local weather or regional radiation budget may also need to be studied. In this work, light scattering characteristics of these metallic aerosols are studied using exact solutions on perfectly conducting spherical and cylindrical particles. It is found that for perfectly conducting spheres and cylinders, when scattering angle is larger than ~90 o the linear polarization degree of the scattered light is very close to zero. This light scattering characteristics of perfectly conducting particles is significantly different from that of other aerosols. When these perfectly conducting particles are immersed in an absorbing medium, this light scattering characteristics does not show significant change. Therefore, measuring the linear polarization of scattered lights at backward scattering angles can detect and distinguish metallic particulates from other aerosols. This result provides a great potential of metallic aerosol detection and monitoring for environmental protection.

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Finite-difference time-domain solution of light scattering by dielectric particles with a perfectly matched layer absorbing boundary condition

Cited by 158 publications

References 51 publications

Investigation of ice particle habits to be used for ice cloud remote sensing for the GCOM-C satellite mission

Investigation of ice particle habits to be used for ice cloud remote sensing for the GCOM-C satellite mission

Effective Permittivity for FDTD Calculation of Plasmonic Materials

Optical characterization of metallic aerosols

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