title: Calculation of optical forces on an ellipsoid using vectorial ray tracing method.
abstract: 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.
authors: Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei, Anhui, 230026, China.
authors: Jin-Hua
authors: JH
authors: Zhou
authors: Min-Cheng
authors: MC
authors: Zhong
authors: Zi-Qiang
authors: ZQ
authors: Wang
authors: Yin-Mei
authors: YM
authors: Li