Light scattering by anisotropic spherical particles: Rayleigh-Gans approximation versus T-matrix theory

Alexei D. Kiselev; A. A. Panyukov; Victor Yu. Reshetnyak; Timothy J. Sluckin

doi:10.1117/12.486658

11 December 2002 Light scattering by anisotropic spherical particles: Rayleigh-Gans approximation versus T-matrix theory

Alexei D. Kiselev, A. A. Panyukov, Victor Yu. Reshetnyak, Timothy J. Sluckin

Author Affiliations +

Proceedings Volume 4938, Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals; (2002) https://doi.org/10.1117/12.486658
Event: XV International School on Spectroscopy of Molecules and Crystals, 2001, Chernivsti, Ukraine

Abstract

We calculated the scattering of light by composite anisotropic particles embedded in an isotropic matrix by using the T-matrix ansatz. The model scatterer is assumed to consist of a small central isotropic particle coated by a much larger region in which the optical tensor is radially anisotropic. We determine the region of validity of Rayleigh-Gans approximation (RGA) by comparing approximate values of the scattering cross-section and the dispersion index with the results computed from the exact solution. Both of the scatterers with isotropic and radially anisotropic annular layers have been studied. Our results show that RGA for anisotopic scatterers gives less accurate estimates than when the scatterer is isotropic. In the small particle limit, we have calculated the value of dielectric contrast of effective isotropic sactterer as a function of anisotropy parameter and the layer thickness. We have found that averaging the dielectric tensor over angles gives correct results only if the anisotropy parameter is small.

Citation Download Citation

Alexei D. Kiselev, A. A. Panyukov, Victor Yu. Reshetnyak, and Timothy J. Sluckin "Light scattering by anisotropic spherical particles: Rayleigh-Gans approximation versus T-matrix theory", Proc. SPIE 4938, Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals, (11 December 2002); https://doi.org/10.1117/12.486658

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available