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Ray optics in combination with the Gaussian beam propagation method for optical trapping of free-shaped particles in microfluidic systems

Publication date 2013
B-Phot Authors Heidi Ottevaere
Citation
D. De Coster, P. Wuytens, H. Ottevaere, and H. Thienpont, “Ray optics in combination with the Gaussian beam propagation method for optical trapping of free-shaped particles in microfluidic systems,” in Proc. SPIE,Conference on Optical Trapping and Optical Micromanipulation X, 2013, vol. 8810, p. 88102Q.
Abstract We present a novel model for the prediction of particle trapping, in which different assets are combined to calculate optical forces and torques on free-shaped particles. This model suits well for designing an integrated dual fiber optical trap into a microfluidic chip. The force and torque estimation can easily be integrated in the scheme simulating the surrounding optofluidic chip. The propagation of the trapping laser light going through this micro-optical chip is ensured by the 'Gaussian Beam Propagation Method' allowing a realistic propagation of various beam profiles in and near the Rayleigh range. Back-reflected rays into and outside the particle are considered by using a non-sequential ray-tracing model. Our model enables the prediction of circumstances in which particles are trapped and how they behave in the optical trap.
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