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中文摘要：
利用几何光学模型，取不同的粒子半径、数值孔径和探测深度，计算光镊中粒子受到的轴向力．从粒子在空间各位置的轴向力及其变化，分析球差对捕获效率的影响．计算结果表明：球差的存在，使得激光没有理想聚焦点，粒子在光镊中的稳定平衡点向负光轴方向位移，并降低了光镊捕获粒子的稳定性．
英文摘要：
Axial force exerting on the particle in optical tweezers was calculated with different radii of particles, numeri- cal apertures and detection depths in ray optics model. Through detecting the axial force and its changing versus the spa- tial positions, the effect of spherical aberrations on the efficiency of optical trapping was analyzed. The results of calcula- tion show that, owing to the existing of spherical aberration, the ideal focus of the laser beam is disappear, the stable e- quilibrium point is moved along the negative optical axis direction, and the stability of optical trapping is reduced.
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