## Modeling optical properties of particles with small-scale surface roughness: combination of group theory with a perturbation approach |

Optics Express, Vol. 19, Issue 12, pp. 11138-11151 (2011)

http://dx.doi.org/10.1364/OE.19.011138

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### Abstract

A T-matrix method for scattering by particles with small-scale surface roughness is presented. The method combines group theory with a perturbation expansion approach. Group theory is found to reduce CPU-time by 4–6 orders of magnitude. The perturbation expansion extends the range of size parameters by a factor of 5 compared to non-perturbative methods. An application to optically hard particles shows that small-scale surface roughness changes scattering in side- and backscattering directions, and it impacts the single-scattering albedo. This can have important implications for interpreting remote sensing observations, and for the climate impact of mineral aerosols.

© 2011 OSA

**OCIS Codes**

(010.1110) Atmospheric and oceanic optics : Aerosols

(010.1290) Atmospheric and oceanic optics : Atmospheric optics

(290.1090) Scattering : Aerosol and cloud effects

(290.1350) Scattering : Backscattering

(290.5850) Scattering : Scattering, particles

(290.5880) Scattering : Scattering, rough surfaces

(290.5825) Scattering : Scattering theory

**ToC Category:**

Scattering

**History**

Original Manuscript: April 27, 2011

Revised Manuscript: May 17, 2011

Manuscript Accepted: May 17, 2011

Published: May 23, 2011

**Virtual Issues**

Vol. 6, Iss. 7 *Virtual Journal for Biomedical Optics*

**Citation**

Michael Kahnert and Tom Rother, "Modeling optical properties of particles with small-scale surface roughness: combination of group theory with a perturbation approach," Opt. Express **19**, 11138-11151 (2011)

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-12-11138

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