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Numerical simulation of optical control for a soft particle in a microchannel
Ji Young Moon1, Se Bin Choi2, Jung Shin Lee2
1School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia.
Physical Review. E
|April 3, 2019
Summary
This study simulates optical forces on deformable particles in microchannels using a novel computational method. The findings aid in designing optical manipulation tools for particle sorting and measurement.
Area of Science:
- Multiphysics simulation
- Optical manipulation
- Microfluidics
Background:
- Optical forces, generated by light's momentum transfer, are crucial for controlling microparticles.
- Simulating these forces is complex due to coupled optical, fluidic, and particle deformation effects.
Purpose of the Study:
- To develop and validate a computational framework for simulating deformable particles under optical forces in microchannels.
- To investigate the behavior of particles in optical-separator and optical-stretcher configurations.
Main Methods:
- Three-dimensional lattice Boltzmann immersed-boundary method for coupled simulation.
- Ray optics analysis to calculate optical forces based on intensity, momentum, and direction.
- Simulation of single-source optical separation and dual-source optical stretching.
Main Results:
- Successfully simulated optical forces on deformable particles, considering fluid interaction and light refraction/reflection.
- Quantified particle displacement under a single optical source.
- Analyzed particle deformation in response to dual optical source intensity.
Conclusions:
- The developed simulation method accurately captures complex optical-particle interactions.
- Provides a foundation for designing advanced optical manipulation systems for microparticle applications.
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