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Creation of rotating spiral structures using interfering Bessel beams for optical manipulation

Mohammadbagher Mohammadnezhad, Sarkew Salah Abdulkareem, and Abdollah Hassanzadeh

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Abstract

A simple and effective optical tweezer setup which uses the interference of two counter propagating Bessel beams is proposed and investigated. The potential energy of a Rayleigh particle in the generated interference patterns is numerically evaluated by writing a MATLAB code. A rigorous analytical treatment is also performed for verification of the numerical results. The results show that the generated patterns have a spiral structure. It is also found that these spiral patterns and consequently the trapped particles can be rotated about the axis of the patterns by introducing a phase difference between the two beams. The suggested setup is hoped to provide an effective way for guiding particles along the spiral trajectories, making a laser-driven micro- and nanomotor, measuring the torsional properties of biological molecules, and separating particles from a liquid mixture according to their mass, size, or refractive index.

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Supplementary Material (2)

NameDescription
Visualization 1       The effect of introducing a phase difference between the two beams is demonstrated in the supplementary videos. In the first video (Visualization 1), it is seen that the spiral patterns of the potential energy begin to rotate about the z-axis under t
Visualization 2       The second video (Visualization 1) shows how changing the sign of change the rotation direction of the potential pattern. This can be seen in Eq. (13) that the handedness of rotation, clockwise or counterclockwise, depends on the sign of . In othe

Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Figures (4)

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Equations (13)

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