飞秒激光光镊横向光学力的理论分析

Analysis of the Lateral Optical Force Applied by the Femtosecond Laser Tweezers

旨在将飞秒激光脉冲序列视为对连续光的周期抽样结果 ,分析飞秒激光脉冲序列作为光镊光源捕获电介质微粒时产生的横向光学力 ,并给出受光微粒所受横向光学势阱力的理论模型及计算公式 数值计算结果表明 ,飞秒激光脉冲所产生的横向光学力能抵消由于布朗运动引起的微粒中心偏移的影响 。

The lateral optical force applied on the dielectric particles by the femtosecond laser tweezers is theoretically analyzed. Taking femtosecond laser pulse train as the sampling of the CW light, a numerical model of the induced lateral forces on micrometer sized sphere is found and the formulas are derived. The numerical simulation shows that the lateral optical force applied by femtosecond laser pulse train can eliminate the Brownian movement of the particles and stably trap them.