Trapping of Nano-Particles Using a Near-Field Optical Fiber Probe

Abstract:

By employing a generalization of the conservation law for momentum using the finite difference time domain (FDTD) method, the feasibility of using a near-field optical fibre probe to create near-field optical trapping is investigated. Numerical results indicate that the scheme is able to trap nanoparticles with diameters of tens of nanometres in a circular shape with lower laser intensity. Using the built system with a tapered metal-coated fibre probe, 120 nm polystyrene particles are trapped in a multi-circular shape with a minimum size of 400 nm. They are at a resolution of λ/7 (λ: laser wavelength) and d (d: tip diameter of fiber probe), respectively.

• Periodical: Key Engineering Materials (Volume 516)
• Pages: 90-95
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.516.90
• Online since: June 2012
• Authors: Bing Hui Liu, Li Jun Yang, Yang Wang
• Keywords: Finite Difference Time Domain (FDTD), Maxwell Stress Tensor, Near-Field, Trapping Force

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