Flat-head taper single-hole dual-core suspended-core fiber optical tweezers

In order to achieve the manipulation performance of particles and improve the integration and miniaturization of optical fiber tweezers systems, this paper proposes a flat-head taper single-hole dual-core suspended-core optical fiber tweezers structure based on the characteristics of single-hole dual-core suspended-core optical fibers. By establishing a model of the optical fiber probe's force on micrometer-sized particles according to the principle of momentum conservation and using the finite-difference time-domain method, the distribution of optical trapping forces along each axial direction and the possible influence of particle diameter on the optical trapping forces are simulated and analyzed. Additionally, the capability of the flat-head taper single-hole suspended-core optical fiber to trap particles is verified through experiments. Through analysis and validation, the flat-head taper single-hole dual-core suspended-core fiber optical tweezers with 2 μm diameter hollow hole can achieve diverse manipulation of 2 μm, 5 μm, and 10 μm polystyrene particles. This research provides new insights into the application of single-hole suspended-core optical fibers in optical fiber tweezers.