Abstract
Optical manipulation is a non-contact and non-destructive method to capture and manipulate micro/nano particles, biological macromolecules and cells with application of optical forces. With the rapid development of optical manipulation, various kinds of optical fiber tips have been presented and demonstrated in recent years. In this letter, a novel structure of optical fiber tip with an imbedded hollow cavity is presented. The electric field distribution of the fiber tip and the influence of cavity geometry are simulated with finite-difference time-domain method. The unique advantage is that the electric field intensity will be significantly enhanced when the fiber tip is filled with high refractive index medium in the cavity, which brings the potential to generate a three-dimensional optical trap for particles. Through experiments, we also demonstrate that the velocity of the particles driven by the optical force has a quadratic relationship with the laser power. The relationship can be used in microfluidic technology to measure the velocity of micro fluid. And the balance between the scattering force and the fluid force can be used to study non-invasive migration of particles.
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Acknowledgements
This work was funded by Major Project of Natural Science Foundation of Jiangsu Higher Education Institutions of China (17KJA510002), National Natural Science Foundation of China (51405240), and Program of Natural Science Research of Jiangsu Higher Education Institutions of China (16KJB510017).
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Ni, X., Wang, M., Wang, R. et al. Optical manipulation of microparticles with a fiber tip containing a hollow cavity. Opt Quant Electron 50, 238 (2018). https://doi.org/10.1007/s11082-018-1494-0
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DOI: https://doi.org/10.1007/s11082-018-1494-0