Optical tweezing using tunable optical lattices along a few-mode silicon waveguide

Abstract : Fourteen years ago, optical lattices and holographic tweezers were considered as a revolution, allowing for trapping and manipulating multiple particles at the same time using laser light. Since then, near-field optical forces have aroused tremendous interest as they enable efficient trapping of a wide range of objects, from living cells to atoms, in integrated devices. Yet, handling at will multiple objects using a guided light beam remains a challenging task for current on-chip optical trapping techniques. We demonstrate here on-chip optical trapping of dielectric microbeads and bacteria using one-dimensional optical lattices created by near-field mode beating along a few-mode silicon nanophotonic waveguide. This approach allows not only for trapping a large number of particles in periodic trap arrays with various geometries, but also for manipulating them via diverse transport and repositioning techniques. Near-field mode-beating optical lattices may be readily implemented in lab-on-a-chip devices, addressing numerous scientific fields ranging from bio-analysis to nanoparticle processing.
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Christophe Pin, J.-B. Jager, M. Tardif, E. Picard, E. Hadji, et al.. Optical tweezing using tunable optical lattices along a few-mode silicon waveguide. Lab on a Chip, Royal Society of Chemistry, 2018, 18 (12), pp.1750-1757. ⟨10.1039/c8lc00298c⟩. ⟨cea-01988796⟩

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