分析了两束相对传输的非傍轴高斯光束相干叠加形成的双光束势阱对瑞利粒子产生的辐射力,并作了数值计算.结果表明,与傍轴双光束势阱相比,非傍轴双光束势阱的辐射力有明显的不同,纵向辐射力和横向辐射力都增大,y方向平衡点数目由一个增加到多个,且势阱更深,横向辐射力变化趋势更陡,更有利于微粒的精确定位.与非傍轴单光束势阱相比,势阱更深,所产生的辐射力更大,因而更利于控制瑞利粒子.

Theoretical expressions of the radiation pressure for a dielectric sphere in the Rayleigh regime of light scattering under illumination of axial superposition of two Gaussian beams with different waist positions are derived. The results show that the standing wave trap produced by axial coherent superposition of non paraxial Gaussian beams is better than that of paraxial Guassian beams. On the other hand, the non paraxial standing wave trap produces stronger radiation forces than single beam trap. Moreover, the depth of potential well is four times deeper than that of single beam trap.