Influence of the Kerr Effect on the Optical Force Acting on the Dielectric Particle  

作　　者：Quang Quy Ho Van Nam Hoang 

机构地区：[1]NEWTECHPRO, Vietnam Academy of Science and Technology, Hanoi, Vietnam [2]Council of Science and Technology, Hatinh, Vietnam

出　　处：《Journal of Physical Science and Application》2012年第10期414-419,共6页物理科学与应用（英文版）

摘　　要：Basing on the necessary condition for the trapping dielectric particle by the Gaussian beam, the Kerr effect in the tweezers with the nonlinear particle or the nonlinear medium is proposed to concern. The expressions of the optical forces concerned with the Kerr effect, which affects the refractive index of the medium, are presented. The distribution of the optical forces in the trapping region is simulated and discussed. The results show that the stability of the tweezers depends on the nonlinear coefficient of refractive index, and the optical tweezers could be broken down with a critical value of the nonlinear coefficient of refractive index of the surrounding medium, or with a critical value of the laser intensity, duration of laser pulse, and radius of beam waist. Moreover, these results give us the explanation the stability of the optical tweezers used for the trapped object as biological molecule embedded in the fluid, which is sensitive with Kerr effect.

关 键 词：Optical tweezers optical force Kerr effect nonlinear medium. 

分 类 号：O43[机械工程—光学工程] TN929.11[理学—光学]