Manipulating Gradient Forces on Optical Tweezers using Bessel Beams

TL;DR

This paper demonstrates how superposing Bessel beams with different orders can manipulate particles in optical tweezers by altering gradient forces, enabling non-mechanical control of particle position.

Contribution

It introduces a method to control particle equilibrium in optical tweezers using Bessel beam superposition, without mechanical adjustments.

Findings

Gradient forces depend on particle radius and beam superposition.

Particles can be moved into or out of the beam center by adjusting beam intensities.

Theoretical analysis confirms feasibility of non-mechanical particle manipulation.

Abstract

In this paper, we show how one can change the stable equilibrium of a particle trapped into an optical tweezer by varying the intensity of superposed Bessel beams with different orders. The gradient forces acting on particles of different radii are determined, and the theoretical results indicates that it is possible to combine Bessel beams in such a way as to manipulate the particle into or out the centre of the beam by exploiting their ring-shaped intensity patterns, without any mechanical displacement of the lasers.