Dr. Krzysztof Skorupski Profile

Dr. Krzysztof Skorupski

at Wroclaw Univ of Science and Technology

SPIE Involvement:

Author

Area of Expertise:

Fractal-like aggregates , Light scattering

Websites:

Personal Website

Publications (8)

Proceedings Article | 6 September 2017 Paper

Impact of the necking phenomenon on the spectral behavior of WO3 aggregates

Krzysztof Skorupski

Proceedings Volume 10374, 103740N (2017) https://doi.org/10.1117/12.2273200

KEYWORDS: Particles, Light scattering, Neck, Computer simulations, Refractive index, Performance modeling

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Proceedings Article | 30 August 2017 Presentation + Paper

Determination of the spectral behaviour of atmospheric soot using different particle models

Krzysztof Skorupski

Proceedings Volume 10408, 104080W (2017) https://doi.org/10.1117/12.2273192

KEYWORDS: Atmospheric particles, Carbon, Light scattering, Refractive index, Atmospheric modeling, Particles, Computer simulations

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Proceedings Article | 21 April 2016 Paper

Effect of the particle shape on the optical properties of black carbon aggregates

Krzysztof Skorupski

Proceedings Volume 9884, 98842M (2016) https://doi.org/10.1117/12.2227387

KEYWORDS: Particles, Light scattering, Optical properties, Carbon, Connectors, Combustion, Particles, Climate change, Neptunium, Scattering, Absorption

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Small particles tend to connect to each other and create large geometries, namely aggregates. To simplify the light scattering simulation process, they are usually modelled as assemblies of spheres positioned in point contact. This is a rough approximation because connections between them always exist. In this work we present answers to the three following questions: which optical properties of fractal-like aggregates are strongly dependent on the particle shape, what is the magnitude of the relative extinction error σC^ext when non-spherical particles are modelled as spheres and whether the relative extinction error σC^ext is dependent on the aggregate size N_p. The paper was aimed at tropospheric black carbon particles and their complex refractive index m was based on the work by Chang and Charalampopoulos. The incident wavelength λ varied from λ = 300nm to λ = 900nm. For the light scattering simulations the ADDA algorithm was used. The polarizability expression was IGT_SO (approximate Integration of Greens Tensor over the dipole) and each particle, regardless of its shape, was composed of ca. N_d ≈ 1000 volume elements (dipoles). In the study, fractal-like aggregates consisted of up to N_p = 300 primary particles with the volume equivalent to the volume of a sphere with the radius r_p = 15nm. The fractal dimension was D_f = 1:8 and the fractal prefactor was k_f = 1:3. Geometries were generated with the tunable CC (Cluster-Cluster) algorithm proposed by Filippov et al. The results show that when the extinction cross section σC^ext is considered, the changes caused by the particle shape, which are especially visible for longer wavelengths λ cannot be neglected. The most significant difference can be observed for the regular tetrahedron. The relative extinction error σC^ext diminishes slightly along with the number of primary particles N_p. However, even when large fractal-like aggregates are studied, it should not be considered as non-existent. On the contrary, when light scattering diagrams or the asymmetry parameter g are needed, spherical models can be used, even with relatively small fractal-like aggregates.

Proceedings Article | 22 June 2015 Paper

Modeling and analysis of the two-dimensional polystyrene aggregation process

Krzysztof Skorupski, Imre Horvath, Maria Vetrano

Proceedings Volume 9530, 95300H (2015) https://doi.org/10.1117/12.2184640

KEYWORDS: Particles, Fractal analysis, Microscopy, Neptunium, Image analysis, Algorithm development, Image processing, Liquids, Roentgenium, Process modeling

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Proceedings Article | 21 June 2015 Paper

The optical properties of tropospheric soot aggregates determined with the DDA (Discrete Dipole Approximation) method

Krzysztof Skorupski

Proceedings Volume 9526, 95260N (2015) https://doi.org/10.1117/12.2184634

KEYWORDS: Particles, Carbon, Optical spheres, Light scattering, Absorption, Scattering, Optical properties, Refractive index, Superposition, Atmospheric particles

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Proceedings Article | 18 May 2015 Paper

The accuracy of the DDA (Discrete Dipole Approximation) method in determining the optical properties of black carbon fractal-like aggregates

Krzysztof Skorupski

Proceedings Volume 9503, 95030U (2015) https://doi.org/10.1117/12.2178646

KEYWORDS: Particles, Neptunium, Optical properties, Light scattering, Carbon, Molybdenum, Connectors, Optical spheres, Fractal analysis, Spherical lenses

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Proceedings Article | 2 May 2014 Paper

Changes in the optical properties of two gold nanoparticles caused by different connection types

Krzysztof Skorupski

Proceedings Volume 9126, 912635 (2014) https://doi.org/10.1117/12.2052319

KEYWORDS: Neck, Refractive index, Particles, Gold, Optical properties, Nanoparticles, Connectors, Optical spheres, Neodymium, Light scattering

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Proceedings Article | 2 May 2014 Paper

Optical properties of TiO2:Ag composites

Krzysztof Skorupski

Proceedings Volume 9125, 91251J (2014) https://doi.org/10.1117/12.2052262

KEYWORDS: Silver, Particles, Composites, Optical spheres, Gold, Optical properties, Light scattering, Visible radiation, Refractive index, Titanium dioxide

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Showing 5 of 8 publications

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