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基于动量守恒原理,采用2维时域有限差分方法(2D FDTD)建立了激光场对微米量级微球的作用力模型,讨论了入射高斯光场的波长、束腰半径、微球的折射率和半径等对聚焦光场俘获力的影响.结果表明:位于聚焦光场中特定位置的微球可被俘获,当离轴距离增加,俘获力减小.微球所受到的俘获力与微球的折射率有关,当小于环境折射率时(如汽泡),不能形成俘获,而被推离光场.模拟结果与其他文献中报道的实验结果一致.
Based on the principle of conservation of momentum, a two-dimensional finite difference time-domain method (2D FDTD) was used to establish the model of the force acting on the microscale microsphere. The effects of the incident Gaussian optical field, such as the wavelength, the radius of the beam waist, the refractive index of the microsphere And radius on the trapping force of the focused light field.The results show that the microspheres located at specific positions in the focused light field can be captured and the capture force decreases as the off-axis distance increases.The entrapment force of the microsphere and the microsphere When the refractive index is less than the ambient refractive index (such as bubble), it can not form a trap but is pushed away from the light field.The simulation results are consistent with the experimental results reported in other literatures.