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Precise control of particle positioning is desirable in many opticalpropulsion and sorting applications. Here, we develop an integrated platformfor particle manipulation consisting of a combined optical nanofibre andoptical tweezers system. Individual silica microspheres were introduced to thenanofibre at arbitrary points using the optical tweezers, thereby producingpronounced dips in the fibre transmission. We show that such consistent andreversible transmission modulations depend on both particle and fibre diameter,and can be used as a reference point for in situ nanofibre or particle sizemeasurement. Thence, we combine scanning electron microscope (SEM) sizemeasurements with nanofibre transmission data to provide calibration forparticle-based fibre assessment. This integrated optical platform provides amethod for selective evanescent field manipulation of micron-sized particlesand facilitates studies of optical binding and light-particle interactiondynamics.

Optical nanofibre integrated into an optical tweezers for particle manipulation, in situ fibre probing, and optical binding studies