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Study on trapping force of focused optical field on the microsphere with the FDTD method

Yang Hao Feng Guo-Ying Zhang Da-Yong Zhou Shou-Huan Zhu Qi-Hua

Study on trapping force of focused optical field on the microsphere with the FDTD method

Yang Hao, Feng Guo-Ying, Zhang Da-Yong, Zhou Shou-Huan, Zhu Qi-Hua
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  • Abstract views:  3544
  • PDF Downloads:  1418
  • Cited By: 0
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  • Received Date:  22 January 2008
  • Accepted Date:  03 February 2008
  • Published Online:  20 September 2008

Study on trapping force of focused optical field on the microsphere with the FDTD method

  • 1. (1)四川大学电子信息学院,成都 610064; (2)四川大学电子信息学院,成都 610064;华北光电技术研究所,北京 100015; (3)四川大学电子信息学院,成都 610064;中国工程物理研究院激光聚变研究中心,绵阳 621900

Abstract: The model of trapping force on microsphere based on the conservation of momentum are presented. Using 2-D FDTD algorithm, we calculated the effects of the wave length, waist of the Gaussian beam, the radius and refractive index of the microsphere on the trapping force. The results show that the microsphere located in a certain zone of focused laser optical electromagnetic fields will be trapped, and the trapping force deceases with the increase of the distance of the observed point away from the axis. When the refractive index of the surrounding medium is greater than that of the microsphere (such as an air bubble), it will be pushed out of the laser beam. The simulation results are in good aggrement with the experimental observation.

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