研究目的
Investigating the light pressure on an inhomogeneous spherical dielectric particle in the field of laser tweezers and estimating the core size from the spatial dynamics of the particle.
研究成果
The light pressure on an inhomogeneous spherical particle significantly depends on the core radius, allowing the core size to be estimated from the particle's spatial dynamics in optical tweezers. This finding can be applied to sort particles by core sizes and optimize the capture of inhomogeneous biological objects.
研究不足
The study is limited to the geometrical optics approximation and does not account for wave optics effects. The model assumes sharp interfaces between the media and does not consider gradient refractive indices.
1：Experimental Design and Method Selection:
The study uses the geometrical optics approximation to calculate the forces acting on an inhomogeneous spherical particle in a laser beam with a Gaussian intensity profile. The radiation propagation is analyzed considering the different refractive indices of the core, the shell, and the surrounding medium.
2：Sample Selection and Data Sources:
The particle is modeled as a spherical dielectric with a shell and a core of different refractive indices. The laser beam has a Gaussian intensity profile.
3：List of Experimental Equipment and Materials:
A laser beam with a Gaussian intensity profile is used to exert light pressure on the particle.
4：Experimental Procedures and Operational Workflow:
The light pressure force is calculated for various core sizes and refractive index relations. The particle's dynamics in the laser beam field are simulated.
5：Data Analysis Methods:
The forces are analyzed to determine the particle's behavior in the laser beam, including drawing into or pushing out of the beam region.
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