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基于几何光学原理,以射线光学计算模型为基础,对几何尺寸远大于光波长的米氏球状粒子所受轴向光阱力进行了计算。在给定参量条件下,进行了数值仿真,并根据仿真结果,讨论了光束束腰半径、相对折射率、激光波长及功率等系统主要参量与光阱品质特性的关系。这些参量都是由显微镜和其他一些光学部件的特性所决定的。针对不同介质粒子合理选择上述参量,以得到较大光阱力和光阱刚度。这些仿真结果为各仪器参量的选择提供了理论依据。
Based on the principle of geometrical optics and based on the ray optics calculation model, the axial light trapping force of the Mie spheroidal particles whose geometrical size is much larger than the light wavelength is calculated. Under the condition of given parameters, numerical simulation is carried out. According to the simulation results, the relationship between the main parameters of the beam waist radius, relative refractive index, laser wavelength and power and the quality characteristics of light traps is discussed. These parameters are determined by the characteristics of the microscope and some other optical components. For different media particles reasonable choice of the above parameters, in order to get a larger optical trap force and optical trap stiffness. These simulation results provide a theoretical basis for the selection of the parameters of various instruments.