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Updated: Jan 22, 2026

Optical Trapping of Nanoparticles
Published on: January 15, 2013
Fokker-Planck analysis of optical near-field traps
Mohammad Asif Zaman1, Punnag Padhy2, Lambertus Hesselink2
1Stanford University, Electrical Engineering, Stanford, CA, 94305, USA. zaman@stanford.edu.
Abstract:
The motion of a nanoparticle in the vicinity of a near-field optical trap is modeled using the Fokker-Planck equation. A plasmonic C-shaped engraving on a gold film is considered as the optical trap. The time evolution of the position probability density of the nanoparticle is calculated to analyze the trapping dynamics. A spatially varying diffusion tensor is used in the formulation to take into account the hydrodynamic interactions. The steady-state position distribution obtained from the Fokker-Planck equation is compared with experimental results and found to be in good agreement. Computational cost of the proposed method is compared with the conventionally used Langevin equation based approach. The proposed method is found to be computationally efficient (requiring 35 times less computation time) and scalable to more complex lab-on-a-chip systems.
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