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Computation of radiation pressure force on arbitrary shaped homogenous particles by multilevel fast multipole
Minglin Yang1, Kuan Fang Ren, Mingjiang Gou
1Center for Electromagnetic Simulation, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China.
Optics Letters
|June 1, 2013
Summary
This study introduces a numerical method to calculate radiation pressure force on complex particles using shaped light beams. The advanced technique accurately models forces on particles up to 100 wavelengths, crucial for optical manipulation research.
Area of Science:
- Computational physics
- Electromagnetics
- Optical forces
Background:
- Calculating radiation pressure force (RPF) on arbitrarily shaped particles is computationally challenging.
- Existing methods often lack accuracy or efficiency for complex particle geometries and arbitrary light beams.
Purpose of the Study:
- To develop and validate a full-wave numerical method for computing RPF on homogenous particles of arbitrary shape illuminated by shaped light beams.
- To enhance computational efficiency using the multilevel fast multipole algorithm (MLFMA).
Main Methods:
- Surface integral equation formulation for RPF calculation.
- Application of the multilevel fast multipole algorithm (MLFMA) for computational efficiency.
- Iterative solution of the matrix equation to obtain equivalent electric and magnetic currents.
- Computation of RPF using the Maxwell's stress tensor.
Main Results:
- The method accurately computes RPF for shaped beams on complex particles.
- Validated against Lorenz-Mie theory for spherical and small spheroidal particles.
- Demonstrated capability for particles up to 50-100 wavelengths (ellipsoidal and red blood cell-like shapes).
Conclusions:
- The developed numerical method is a powerful tool for accurate RPF computation on complex particles.
- The MLFMA significantly improves efficiency, enabling simulations of larger particles.
- This method advances the understanding and application of optical forces in complex systems.
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