High-precision control of nanoparticles using fractional-order vortex laser beams

Dai Jinyu; Zhang Xioahe

doi:10.11884/HPLPB202638.250070

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Dai Jinyu, Zhang Xioahe. High-precision control of nanoparticles using fractional-order vortex laser beams[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250070

Citation:

Dai Jinyu, Zhang Xioahe. High-precision control of nanoparticles using fractional-order vortex laser beams[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250070

Dai Jinyu, Zhang Xioahe. High-precision control of nanoparticles using fractional-order vortex laser beams[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250070

Citation:

Dai Jinyu, Zhang Xioahe. High-precision control of nanoparticles using fractional-order vortex laser beams[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202638.250070

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High-precision control of nanoparticles using fractional-order vortex laser beams

doi: 10.11884/HPLPB202638.250070

Dai Jinyu,
Zhang Xioahe^,

School of Automation, Nanjing University of Information Science and Technology, Nanjing 210044, China

Received Date: 2025-03-11
Accepted Date: 2025-09-23
Rev Recd Date: 2025-11-11

Available Online: 2025-11-26

Abstract

Abstract

Background
Optical manipulation based on integer-order vortex beams is widely used in nanotechnology, yet their discrete nature restricts continuous and precise transverse control of nanoparticles.
Purpose
This study aims to overcome this limitation by proposing a novel approach using fractional-order vortex beams (FVBs), with the goal of achieving continuous and precise transverse optical trapping and manipulation of nanoparticles.
Methods
We developed a vector diffraction model to characterize the focal field of FVBs, revealing it as a coherent superposition of integer-order modes with a highly asymmetric weight distribution. Additionally, an optical force model was established to analyze the trapping behavior of spherical nanoparticles. Theoretical calculations and Langevin dynamics simulations were employed to evaluate the three-dimensional trapping stability and multi-degree-of-freedom manipulation capability.
Results
The transverse trapping position exhibits a linear dependence on the fractional topological charge. By continuously tuning the topological charge, nanoparticles can be displaced precisely and continuously in the transverse plane with sub-wavelength accuracy—a capability not achievable with conventional integer-order vortex beams. Simulations further confirm the stability of the three-dimensional trap and the feasibility of coordinated multi-degree-of-freedom manipulation.
Conclusions
This work demonstrates that fractional-order vortex beams offer a superior alternative for high-precision optical manipulation. They provide a powerful and novel technique for applications in microfluidics, nanofabrication, and lab-on-a-chip devices.
- light-matter interaction,
- optical tweezers,
- optical field modulation,
- optical forces,
- optical manipulation

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References(27)

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