Effect of excess surface charges on optical measurement of sub-micron particles with different properties

Zhen Zhou; Siqi Zhang; Kangkang Guo; Xiaotong Na; Jia Qi; Xu Yang

doi:10.1117/12.2578185

5 November 2020 Effect of excess surface charges on optical measurement of sub-micron particles with different properties

Zhen Zhou, Siqi Zhang, Kangkang Guo, Xiaotong Na, Jia Qi, Xu Yang

Author Affiliations +

Proceedings Volume 11568, AOPC 2020: Optics Ultra Precision Manufacturing and Testing; 115680U (2020) https://doi.org/10.1117/12.2578185
Event: Applied Optics and Photonics China (AOPC 2020), 2020, Beijing, China

Abstract

The exploration of the optical properties of charged particles is essential for the optical detection of ultrafine particles. In this paper, the complex refractive index model and scattering model of spherical particles are re-established to make them suitable for both electrically neutral particles and charged particles. Taking pure-water droplets and salt-water droplets as examples, the effects of surface charge on the complex refractive index of non-dissipative particles and dissipative particles are discussed. On this basis, the effects of excess surface charge on the optical parameters of droplets, inorganic oxide particles and organic compound particles are discussed with three typical dissipative particles. Furthermore, it is confirmed that the effect of charge on particles with different properties is consistent.

Citation Download Citation

Zhen Zhou, Siqi Zhang, Kangkang Guo, Xiaotong Na, Jia Qi, and Xu Yang "Effect of excess surface charges on optical measurement of sub-micron particles with different properties", Proc. SPIE 11568, AOPC 2020: Optics Ultra Precision Manufacturing and Testing, 115680U (5 November 2020); https://doi.org/10.1117/12.2578185

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