Optical Fiber Nano-Tweezers, a complementary approach for Micro- and Nanoparticle Trapping

摘要

We report stable and reproducible trapping of different micro and nanoparticles using a far field dual fiber tip optical tweezers. The tweezers properties are analyzed by studying the trapped particles residual Brownian motion. The trapping potential is harmonic and the trapping forces in transverse direction are typically three times larger with respect to axial direction. Interference fringe trapping is observed for 300 nm YAG particles. Depending on their length, NaYF_4 nanorods are trapped in single or dual fiber tip configurations. Longest rods could be trapped with one single fiber tip at 5 μm away from tip. The experimental results are discussed using numerical simulations based on exact Maxwell Stress Tensor approach.