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Proceedings Paper

Measurement of the light scattering of single and two particles captured with a microfluidic trap
Author(s): Huimin Wang; Kecheng Yang; Baoyu Gong; Dekun Liu; Jie Dai; Long Yu; Min Xia
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Paper Abstract

We have developed a novel light scattering measurement system based on a microfluidic trap to measure the elastic light scattering of micro-particles. The particles were captured from the sample suspension by a microfluidic chip with a hydrodynamic trapping, which were stably immobilized at the predetermined position by the pressure gradient and friction in the micro-channel. The trapped particles were illuminated by a He-Ne laser after refractive index matching, and a narrow-field photodetector designed by the spatial filter and a photomultiplier mounted on a homocentric rotating platform was used to detecting the scattering light. In this paper, we have improved this measurement system. By reducing the background scattering of microfluidic chip to improve the signal-noise ratio and using precise control, we measured the 23.75μm diameter polystyrene microsphere’s light scattering distribution, the results showed a good agreement on the trend with the curves of theoretical result. At the same time, using the microfluidic trap, we captured two particles (same size and different size) in a fixed orientation with touching components and obtained the light scattering distribution.

Paper Details

Date Published: 10 February 2017
PDF: 6 pages
Proc. SPIE 10250, International Conference on Optical and Photonics Engineering (icOPEN 2016), 102501H (10 February 2017); doi: 10.1117/12.2266708
Show Author Affiliations
Huimin Wang, Huazhong Univ. of Science and Technology (China)
Kecheng Yang, Huazhong Univ. of Science and Technology (China)
Baoyu Gong, Huazhong Univ. of Science and Technology (China)
Dekun Liu, Huazhong Univ. of Science and Technology (China)
Jie Dai, MGI Tech Co., Ltd. (China)
Long Yu, Huazhong Univ. of Science and Technology (China)
Min Xia, Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 10250:
International Conference on Optical and Photonics Engineering (icOPEN 2016)
Anand Krishna Asundi; Xiyan Huang; Yi Xie, Editor(s)

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