Single particle sizing approach using angular optical scattering distributions

Chizhu Ding; Kecheng Yang; Wei Li; Min Xia

doi:10.1117/12.2034378

19 September 2013 Single particle sizing approach using angular optical scattering distributions

Chizhu Ding, Kecheng Yang, Wei Li, Min Xia

Proceedings Volume 8905, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Sensing and Imaging and Applications; 89051K (2013) https://doi.org/10.1117/12.2034378
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

Sizing a small particle from its scattered field has been a long-standing problem. Popular established methods require a priori knowledge of either the refractive index of the particle, or the approximate particle size range. In this paper, the diffraction tomography (DT) theory is studied and a single particle sizing approach using angular optical scattering field is proposed. There is a Fourier relationship between the scattering amplitude in the far zone and the scattering potential of the scatterer, under the 1st-order Born approximation for weakly scattering. Based on this relationship, the distribution of scattering potential can be retrieved from angular resolved scattered field by the use of a fast Fourier transform. Single particle size is estimated from the scattering potential. Numerical simulations for spherical particles are presented and discussed. Simulation results show that in the case of low contrast, the size of the particles can be estimated accurately in the presence of moderate noise. A further variant of this algorithm based on Rytov approximation is also discussed.

Citation Download Citation

Chizhu Ding, Kecheng Yang, Wei Li, and Min Xia "Single particle sizing approach using angular optical scattering distributions", Proc. SPIE 8905, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Sensing and Imaging and Applications, 89051K (19 September 2013); https://doi.org/10.1117/12.2034378

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