Open AccessCalculation of optical forces on an ellipsoid using vectorial ray tracing method
Author(s) -
Jinhua Zhou,
Min Zhong,
Ziqiang Wang,
Yinmei Li
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.014928
Subject(s) - ellipsoid , physics , optical force , optics , optical axis , principal axis theorem , optical tweezers , ray tracing (physics) , transverse plane , torque , geometry , mathematics , structural engineering , astronomy , thermodynamics , lens (geology) , engineering
For a triaxial ellipsoid in an optical trap with spherical aberration, the optical forces, torque and stress are analyzed using vectorial ray tracing. The torque will automatically regulate ellipsoid's long axis parallel to optic axis. For a trapped ellipsoid with principal axes in the ratio 1:2:3, the high stress distribution appears in x-z plane. And the optical force at x-axis is weaker than at y-axis due to the shape size. While the ellipsoid departs laterally from trap center, the measurable maximum transverse forces will be weakened due to axial equilibrium and affected by inclined orientation. For an appropriate ring beam, the maximum optical forces are strong in three dimensions, thus, this optical trap is appropriate to trap cells for avoiding damage from laser.