Particles in motion driven by optical binding

Vítězslav Karásek; Pavel Zemánek

doi:10.1117/12.2176044

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5 December 2014 Particles in motion driven by optical binding

Vítězslav Karásek, Pavel Zemánek

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Proceedings Volume 9441, 19th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 944103 (2014) https://doi.org/10.1117/12.2176044
Event: XIX Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2014, Jelenia Gora, Poland

Abstract

In the field of optical micromanipulations the optical landscapes are also used for sorting of micro (nano) particles. This sorting processes are actuated by intense laser fields devised in an arrangement to a particular sorting problem. The primary forces acting on the particles are given by gradient and scattering forces resulting from the design of the optical landscape. Anyway the field scattered by particles gives rise to additional optical forces. This effect is called optical binding and the particles due to their mutual forces induced by light may create an optically bound structure. We study these scattering and forces numerically by the Coupled dipole method (CDM). With this method we can model groups of arbitrary shaped particles of different composition even inhomogeneous. We are interested in asymmetric configurations because the net force acting on the particles is nonzero despite of the group of particles remains optically bound. By these means we offer a new sorting mechanism based on asymmetric scattering of optically bound particles.

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Vítězslav Karásek and Pavel Zemánek "Particles in motion driven by optical binding", Proc. SPIE 9441, 19th Polish-Slovak-Czech Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 944103 (5 December 2014); https://doi.org/10.1117/12.2176044

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