16 September 2014 Optical nanofiber integrated into an optical tweezers for particle manipulation and in-situ fiber probing
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Abstract
Precise control of particle positioning is desirable in many optical propulsion and sorting applications. Here, we develop an integrated platform for particle manipulation consisting of a combined optical nanofiber and optical tweezers system. Individual silica microspheres were introduced to the nanofiber at arbitrary points using the optical tweezers, thereby producing pronounced dips in the fiber transmission. We show that such consistent and reversible transmission modulations depend on both particle and fiber diameter, and may be used as a reference point for in-situ nanofiber or particle size measurement. Therefore we combine SEM size measurements with nanofiber transmission data to provide calibration for particle-based fiber assessment. We also demonstrate how the optical tweezers can be used to create a ‘particle jet’ to feed a supply of microspheres to the nanofiber surface, forming a particle conveyor belt. This integrated optical platform provides a method for selective evanescent field manipulation of micron-sized particles and facilitates studies of optical binding and light-particle interaction dynamics.
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Ivan Gusachenko, Mary C. Frawley, Viet. G. Truong, Síle Nic Chormaic, "Optical nanofiber integrated into an optical tweezers for particle manipulation and in-situ fiber probing", Proc. SPIE 9164, Optical Trapping and Optical Micromanipulation XI, 91642X (16 September 2014); doi: 10.1117/12.2061442; https://doi.org/10.1117/12.2061442
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