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Optical trapping of metallic Rayleigh particles by using coherently and incoherently combined beams

Cheng Ke Zhong Xian-Qiong Xiang An-Ping

Optical trapping of metallic Rayleigh particles by using coherently and incoherently combined beams

Cheng Ke, Zhong Xian-Qiong, Xiang An-Ping
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  • Received Date:  03 July 2011
  • Accepted Date:  05 April 2012
  • Published Online:  05 April 2012

Optical trapping of metallic Rayleigh particles by using coherently and incoherently combined beams

  • 1. College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant No.10874125), the Natural Science Foundation of Sochua Education Committee (Grant No.11ZB258), and the Scientific Foundation of Chengdu University of Information Technology (Grant No.KYTZ201023).

Abstract: The effect of two beam combination schemes, i.e. combination of coherent and incoherent beam, on the radiation force and stability in trapping metallic Rayleigh particles is studied, where the dependences of the radiation force on beam combination scheme, off-axis distance, coherence parameter and particle radius are stressed and illustrated by numerical examples. It is shown that there exist critical values dc and c for different combination schemes. For 0ddc or 0cthe Gaussianthe Gaussian-like intensity profile takes place in the geometrical focal plane, so that the transverse gradient force can act as a restoration force to provide stable equilibrium point. Fordd0,c or00,cthe transverse gradient force can not trap metallic Rayleigh particles. For 0ddc the intensity, the radiation force, the trapping stiffness, and the longitudinal trapping range of coherently combined beam are larger than those of incoherently combined beams. Therefore, a suitable choice of combination scheme, smaller off-axis distance and coherence parameter is beneficial to trapping metallic Rayleigh particles in the use of combined beams.

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