Abstract
Geometrical optics approximation is a classic method for calculating the optical trapping force on particles whose sizes are larger than the wavelength of the trapping light. In this study, the effect of the lens misalignment on optical force was analyzed in the geometrical optics regime. We used geometrical optics to analyze the influence of off-axis placement and the tilt of the lens on the trapping position and stiffness in an optical trap. Numerical calculation results showed that lens tilting has a greater impact on the optical trap force than the off-axis misalignments, and both misalignments will couple with each other and cause a shift of the equilibrium point and the asymmetry of the optical trap stiffness in different ways. Our research revealed the asymmetry in optical traps caused by lens misalignment and can provide guidance for optimize lens placement in future experiments.
Highlights
Optical tweezers have attracted wide attention due to their unique ability to manipulate tiny objects
Numerical Analysis of Optical Trapping Force Affected by Lens Misalignments
Since Ashkin completed the pioneering work of capturing particles [1], optical tweezers have found broad application prospects in many fields ranging from biology [2,3,4] to surface plasmons [5], microparticle and nanoparticle manipulation [6,7,8], macroscopic quantum physics [9], and fundamental physics [10,11]
Summary
Optical tweezers have attracted wide attention due to their unique ability to manipulate tiny objects. Numerical Analysis of Optical Trapping Force Affected by Lens Misalignments. The actual lens has aberrations, and the aberrations will have a significant impact on the optical trapping force [23,24].
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