Abstract
We propose and demonstrate a single fiber optical tweezer for particle multi-dimensional arrangement based on an optical bottle beam produced by concatenating a few-mode fiber and a step-index multimode fiber. We use the mode division multiplexing technology to produce the optical bottle beam with uneven energy distribution. The LP11 and LP21 mode beams are excited by docking a 980 nm single-mode fiber at the outlet of the light source to a few-mode fiber with a defined offset. The few-mode fiber allows LP01, LP11, and LP21 mode beams to be spread in. The optical bottle beam is focused on a high refractive index glass microsphere integrated on the fiber end. The LP01 mode beam is used to trap particles and array them in a one-dimension space (linear arrangement), the LP01 and LP11 mode beams are used to trap and array particles in a two-dimension space (planar arrangement), and the LP01, LP11, and LP21 mode beams are used to trap and array particles in a three-dimension space (solid arrangement). The proposed fiber optical tweezer is simple in structure and will allow us to examine the interaction between the cells when held in close proximity.
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