Comprehensive thematic T-matrix reference database: A 2014–2015 update

Mishchenko, Michael I.; Zakharova, Nadezhda T.; Khlebtsov, Nikolai G.; Videen, Gorden; Wriedt, Thomas

doi:10.1016/j.jqsrt.2015.11.005

Cited by 32 publications

(19 citation statements)

References 212 publications

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“…Over the years, analytic extensions were developed allowing us to compute scattering from axially symmetric particles [30], superellipsoids [31], rotated particles [32], particle ensembles [17,33], orientation averaged scattering [30], particles close or deposited on a surface [34] for particles with known T-matrix. The progress in the field is reflected in the Comprehensive T-matrix reference database [35][36][37][38][39][40], books [27,28,32,41], and collections of simulation programs [42,43]. The results presented in the paper under the name "T-matrix" rely on the superposition T-matrix method [17,33], which was programmed in MATLAB R following [27,32] for defining off diagonal elements of the matrix and using the Lorenz-Mie code described before in Section 4.3 for the diagonal blocks.…”

Section: T-matrix Methodsmentioning

confidence: 99%

Applicability of Effective Medium Approximations to Modelling of Mesocrystal Optical Properties

Zhuromskyy

2016

Crystals

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Rigorous superposition T-matrix method is used to compute light interaction with mesocrystalline structures. The results are used to validate the applicability of effective medium theories for computing the effective optical constants of mesocrystal structures composed of optically isotropic materials. It is demonstrated that the Maxwell-Garnett theory can fit the rigorous simulation results with an average accuracy of 2%. The thus obtained refractive indexes can be used with any electromagnetic simulation software to represent the response of mesocrystals composed of optically small primary particles arranged into a cubic type lattice structures.

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Section: T-matrix Methodsmentioning

confidence: 99%

Applicability of Effective Medium Approximations to Modelling of Mesocrystal Optical Properties

Zhuromskyy

2016

Crystals

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“…The most common choice is the multipolar fields of well defined parity. [9] This is the most convenient option for our initial purposes. Each multipolar field is characterized by its frequency ω, its total angular momentum squared jðj þ 1Þ with j ¼ 1 (dipole), 2 (quadrupole), …, its angular momentum along one chosen axis…”

Section: Using the T-matrix Techniques For Moleculesmentioning

confidence: 99%

Computation of Electromagnetic Properties of Molecular Ensembles

et al. 2020

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We outline a methodology for efficiently computing the electromagnetic response of molecular ensembles. The methodology is based on the link that we establish between quantumchemical simulations and the transfer matrix (T-matrix) approach, a common tool in physics and engineering. We exemplify and analyze the accuracy of the methodology by using the time-dependent Hartree-Fock theory simulation data of a single chiral molecule to compute the T-matrix of a crosslike arrangement of four copies of the molecule, and then computing the circular dichroism of the cross. The results are in very good agreement with full quantum-mechanical calculations on the cross. Importantly, the choice of computing circular dichroism is arbitrary: Any kind of electromagnetic response of an object can be computed from its T-matrix. We also show, by means of another example, how the methodology can be used to predict experimental measurements on a molecular material of macroscopic dimensions. This is possible because, once the T-matrices of the individual components of an ensemble are known, the electromagnetic response of the ensemble can be efficiently computed. This holds for arbitrary arrangements of a large number of molecules, as well as for periodic or aperiodic molecular arrays. We identify areas of research for further improving the accuracy of the method, as well as new fundamental and technological research avenues based on the use of the T-matrices of molecules and molecular ensembles for quantifying their degrees of symmetry breaking. We provide T-matrix-based formulas for computing traditional chiro-optical properties like (oriented) circular dichroism, and also for quantifying electromagnetic duality and electromagnetic chirality. The formulas are valid for light-matter interactions of arbitrarily-high multipolar orders.

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“…For the phase function A 0:7 , we kept the two T-matrix results (irregular and hexagonal ice particles) and used them for all r e of that type of ice cloud. The obvious next upgrade to Solar-J is a redo of the ice-water clouds with a broader, better mix of cloud types (Mishchenko et al, 2016;Yang et al, 2015).…”

Section: Clouds and Aerosolsmentioning

confidence: 99%

“…With this approximation, all upward and downward scattering occurs at a single angle, and the scattering must be treated as isotropic, i.e., independent of sun angle. The ubiquitous adoption of two-stream RT codes by the global climate and weather-forecasting models (e.g., the US Department of Energy (DOE) Accelerated Climate Modeling for Energy (ACME), the National Center for Atmospheric Research (NCAR) Community Earth System Model (CESM), the European Centre for MediumRange Weather Forecasts (ECMWF) model) has been enabled by standardized packages like the Rapid Radiative Transfer Model for general circulation model (GCM) applications (RRTMG), developed based on the correlated-k approach (Mlawer et al, 1997;Clough et al, 2005). A twostream model was certainly necessary at a time when the need for computational efficiency exceeded that for accuracy.…”

Section: Introductionmentioning

confidence: 99%

A radiative transfer module for calculating photolysis rates and solar heating in climate models: Solar-J v7.5

et al. 2017

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Abstract. Solar-J is a comprehensive radiative transfer model for the solar spectrum that addresses the needs of both solar heating and photochemistry in Earth system models. Solar-J is a spectral extension of Cloud-J, a standard in many chemical models that calculates photolysis rates in the 0.18-0.8 µm region. The Cloud-J core consists of an eightstream scattering, plane-parallel radiative transfer solver with corrections for sphericity. Cloud-J uses cloud quadrature to accurately average over correlated cloud layers. It uses the scattering phase function of aerosols and clouds expanded to eighth order and thus avoids isotropic-equivalent approximations prevalent in most solar heating codes. The spectral extension from 0.8 to 12 µm enables calculation of both scattered and absorbed sunlight and thus aerosol direct radiative effects and heating rates throughout the Earth's atmosphere.The Solar-J extension adopts the correlated-k gas absorption bins, primarily water vapor, from the shortwave Rapid Radiative Transfer Model for general circulation model (GCM) applications (RRTMG-SW). Solar-J successfully matches RRTMG-SW's tropospheric heating profile in a clear-sky, aerosol-free, tropical atmosphere. We compare both codes in cloudy atmospheres with a liquid-water stratus cloud and an ice-crystal cirrus cloud. For the stratus cloud, both models use the same physical properties, and we find a systematic low bias of about 3 % in planetary albedo across all solar zenith angles caused by RRTMG-SW's two-stream scattering. Discrepancies with the cirrus cloud using any of RRTMG-SW's three different parameterizations are as large as about 20-40 % depending on the solar zenith angles and occur throughout the atmosphere.Effectively, Solar-J has combined the best components of RRTMG-SW and Cloud-J to build a high-fidelity module for the scattering and absorption of sunlight in the Earth's atmosphere, for which the three major components -wavelength integration, scattering, and averaging over cloud fields -all have comparably small errors. More accurate solutions with Solar-J come with increased computational costs, about 5 times that of RRTMG-SW for a single atmosphere. There are options for reduced costs or computational acceleration that would bring costs down while maintaining improved fidelity and balanced errors.

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Comprehensive thematic T-matrix reference database: A 2014–2015 update

Cited by 32 publications

References 212 publications

Applicability of Effective Medium Approximations to Modelling of Mesocrystal Optical Properties

Applicability of Effective Medium Approximations to Modelling of Mesocrystal Optical Properties

Computation of Electromagnetic Properties of Molecular Ensembles

A radiative transfer module for calculating photolysis rates and solar heating in climate models: Solar-J v7.5

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