单光镊光阱力分析  

An Analysis for Optical Trapping Force in Single Beam Optical Tweezers

作　　者：赵海军[1] 朱占收[1] 徐建波[1] 

机构地区：[1]山东师范大学物理与电子科学学院,山东济南250014

出　　处：《云南师范大学学报（自然科学版）》2006年第1期38-41,共4页Journal of Yunnan Normal University:Natural Sciences Edition

基　　金：山东省自然科学基金资助项目(Y2003A01)

摘　　要：在几何光学近似下,利用光线追踪法分析了激光微束作用于微粒的作用力,数值计算中考虑了激光微束的具体结构对光阱力的影响。分析表明:相对折射率和激光束腰对光阱力有重要影响,另外激光波长和微粒大小对光阱力也有一定影响。By means of single beam tracing method, the force of micro--beam exerting to microscopic particles is analyzed in the condition of geometrical optics approximation. The effects of laser micro--beam on optical trapping force are introduced. Numerical results show that not only the rela- tive refraction index has an important effect on optical trapping force, but also the optical waist has one, too. Furthermore, the wavelength of laser and the size of microscopic particles has a lesser effect on optical trapping force, respectively.

关 键 词：光镊 激光微束 梯度力 捕获 

分 类 号：O439[机械工程—光学工程]