Radiation forces of a focused partially coherent flattened vortex beam on a Rayleigh spherical particle

详细信息    查看全文

• 作者：Ke Cheng^a ; Baida L&#xfc ; ^b ; ^{baidalu0@qq.com}
• 关键词：Radiation force (RF) ; Partially coherent flattened vortex beam ; Rayleigh spherical particle
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2011
• 出版时间：April 2011
• 年：2011
• 卷：122
• 期：7
• 页码：604-609
• 全文大小：1029 K

文摘

A focused partially coherent flattened vortex beam used to trap a Rayleigh dielectric spherical particle with relative refractive index p < 1 is studied. The dependence of radiation forces (RFs) on the beam order N, waist width w₀, correlation length σ₀, particle radius a and focal length f is analyzed and illustrated by numerical examples. By a suitable choice of N, w₀, σ₀ and f a stable trap of the Rayleigh particle is achievable. In particular, there exist critical values w_0,c, σ_0,c for a partially coherent flattened vortex beam the particle can be trapped by the beam with w₀ less than w_0,c and σ₀ larger than σ_0,c. A comparison with the previous work is made.