非傍轴高斯光束产生的辐射力

Radiation Forces Produced by Non-paraxial Gaussian Beams

本文给出了非傍轴高斯光束形成的单光束势阱对瑞利粒子所产生的辐射力公式 ,并作了数值计算。结果表明 ,与傍轴高斯光束所形成的单光束阱相比较 ,非傍轴单光束势阱具有 2方面的优势 ,1)是所产生的辐射力更大 ;2 )是存在多个平衡点 ,因而更利于控制瑞利粒子。

Theoretical expressions of the radiation forces on a dielectric sphere in the Rayleigh regime of light scattering under illumination of a non paraxial laser beam are derived.We show that the single beam trapping produced by a non paraxial Gaussian beam is better than that of a paraxial Guassian beam in two respects,one is that the radiation forces are larger,the other is that there are multi equilibrium positions,which indicate that non paraxial trapping is more suitable in controlling Rayleigh particles.