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