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While conventional optical trapping techniques can trap objects withsubmicron dimensions, the underlying limits imposed by the diffraction of lightgenerally restrict their use to larger or higher refractive index particles. Asthe index and diameter decrease, the trapping difficulty rapidly increases;hence, the power requirements for stable trapping become so large as to quicklydenature the trapped objects in such diffraction-limited systems. Here, wepresent an evanescent field based device capable of confining low indexnanoscale particles using modest optical powers as low as 1.2 mW, withadditional applications in the field of cold atom trapping. Our experiment usesa nanostructured optical micro-nanofiber to trap 200 nm, low index contrast,fluorescent particles within the structured region, thereby overcomingdiffraction limitations. We analyze the trapping potential of this device bothexperimentally and theoretically, and show how strong optical traps areachieved with low input powers.

Evanescent field trapping of nanoparticles using nanostructured ultrathin optical fibers