Internal absorption cross sections in a stratified sphere

Mackowski, Daniel W.; Altenkirch, Robert A.; Mengüç, M. Pınar

doi:10.1364/ao.29.001551

Cited by 113 publications

(65 citation statements)

References 13 publications

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“…Consequently, if the spherical Hankel functions h l (kr) = j l (kr) + iy l (kr) [58], its precision may be drastically compromised. Therefore, it is always recommended to determine h (1) l (kr) by a direct independent recurrence, such as that proposed by Mackowski et al [59] [see recurrences (63), (64) therein]. Otherwise the radiative decay result for the interior of the nanoshell C may differ by up to four-orders of magnitude from the correct one.…”

Section: Numerical Subtletiesmentioning

confidence: 99%

“…Otherwise the radiative decay result for the interior of the nanoshell C may differ by up to four-orders of magnitude from the correct one. If one can perform calculations in an extended precision, this pathological behaviour can be largely overcome, yet the independent recurrence by Mackowski et al [59] is still highly recommended.…”

Section: Numerical Subtletiesmentioning

confidence: 99%

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Spectroscopic properties of a two-level atom interacting with a complex spherical nanoshell

Moroz

2005

Chemical Physics

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Frequency shifts, radiative decay rates, the Ohmic loss contribution to the nonradiative decay rates, fluorescence yield, and photobleaching of a two-level atom radiating anywhere inside or outside a complex spherical nanoshell, i.e. a stratified sphere consisting of alternating silica and gold concentric spherical shells, are studied. The changes in the spectroscopic properties of an atom interacting with complex nanoshells are significantly enhanced, often more than two orders of magnitude, compared to the same atom interacting with a homogeneous dielectric sphere. The detected fluorescence intensity can be enhanced by 5 or more orders of magnitude. The changes strongly depend on the nanoshell parameters and the atom position. When an atom approaches a metal shell, decay rates are strongly enhanced yet fluorescence yield exhibits a well-known quenching. Rather contra-intuitively, the Ohmic loss contribution to the nonradiative decay rates for an atomic dipole within the silica core of larger nanoshells may be decreasing when the silica core -inner gold shell interface is approached. The quasistatic result that the radial frequency shift in a close proximity of a spherical shell interface is approximately twice as large as the tangential frequency shift appears to apply also for complex nanoshells. Significantly modified spectroscopic properties (see computer program freely available at http://www.wave-scattering.com) can be observed in a broad band comprising all (nonresonant) optical and near-infrared wavelengths.

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Section: Numerical Subtletiesmentioning

confidence: 99%

Section: Numerical Subtletiesmentioning

confidence: 99%

Spectroscopic properties of a two-level atom interacting with a complex spherical nanoshell

Moroz

2005

Chemical Physics

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“…One of the best descriptions of the method can be found in the book of Bohren and Huffman [22]. The results presented in this paper were obtained with an own implementation of the method in MATLAB R using the recipes from [23,24] to improve the numerical stability of the code for systems with large refractive index differences.…”

Section: Lorenz-mie Scatteringmentioning

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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“…The soot cores inside water droplets are usually assumed to be spherical particles in climate and remote sensing applications. Thus, using the extended Mie theory for coated spheres (Mackowski et al, 1990), or using the classical Mie theory combined with an effective medium approximation (Bohren, 1986), the optical properties of spherical soot inside water droplets can be easily computed. However, the above two methods can not work for the aggregated soot inside water droplets.…”

Section: Soot Aggregate Inside a Water Dropletmentioning

confidence: 99%

The Effects of Morphology and Water Coating on the Optical Properties of Soot Aggregates

Fan

Chen

et al. 2016

Aerosol Air Qual. Res.

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Soot particles positively influence radiative forcing due to their strong absorption. Because of their chain-like structure, aggregated soot particles become more compact with the aging process, and the monomers or particles are always covered by water coatings. The optical parameters of two typical soot-water mixtures (i.e., an aggregate with core-shell monomers and a soot aggregate inside a water droplet) at 550 nm were investigated using the superposition T-matrix method, with a focus on the impact of the morphology and water coating of soot aggregates. For the soot aggregate with core-shell monomers, a relationship among the fractal dimension, relative humidity (RH) and monomer number was established and used to calculate optical parameters. The intensity of forward scattering declined with the increasing RH. The Cext, Csca, Cabs and SSA are much more insensitive to RH under higher RH conditions (RH > 90%) than at a lower RH level. In addition, hygroscopic shrinkage and the thickness of water coating have stronger effects on the optical properties of larger aggregated soot at higher RH than lower RH. For another mixing state, the soot aggregate inside a water droplet, the morphology of the soot core plays an important role in the optical properties when the thickness of the water shell is small. When the diameter ratio of the water droplet to the aggregated soot (D_ratio) changes from 1.2 to 2.8, Cext difference increases from 0.23 µm 2 to 2.36 µm 2 for particles with N = 100 and 500, whereas the SSA difference decreases from 0.12 to 0.01. If the agglomerated structure of the soot core is not considered, the Cext, Csca and SSA will be underestimated for a relatively small D_ratio of 1.2. Ignoring the soot core in the water droplet could introduce large errors into the calculation of the optical parameters, and ignoring the structure of the aggregated soot core could enlarge the errors.

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Internal absorption cross sections in a stratified sphere

Cited by 113 publications

References 13 publications

Spectroscopic properties of a two-level atom interacting with a complex spherical nanoshell

Spectroscopic properties of a two-level atom interacting with a complex spherical nanoshell

Applicability of Effective Medium Approximations to Modelling of Mesocrystal Optical Properties

The Effects of Morphology and Water Coating on the Optical Properties of Soot Aggregates

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