激光波长对纳米光纤俘获和输送聚苯乙烯微球的影响

研究激光波长对纳米光纤俘获和输送聚苯乙烯微球能力的影响.理论分析结果表明,当光纤直径和激光功率一定时,随着激光波长的增大,光纤外面倏逝波的分布范围和强度都变大,微球所受到的光梯度力和散射力也随之增大,这意味着纳米光纤俘获和输送微球的能力随着激光波长的增大而增强.实验现象和理论预测完全符合.将三种波长的激光分别导入直径为600 nm的光纤中,通过实验观察发现,随着激光波长的增大,俘获微球所需要的临界功率变小,意味着光纤俘获微球的能力增强;而当激光功率一定时,随着激光波长的增大,微球的运动速度也增大,说明光纤输送微球的能力增强.

Laser wavelength influence on capture and delivery of polystyrene microspheres using nanofibers

In the paper we study the effects of laser wavelength on capture and delivery of polystyrene microspheres using a nanofiber. Theoretical analysis shows that when the fiber diameter and the power of the laser are fixed, with the increase of the laser wavelength, the range and intensity of evanescent wave outside optical fiber become large and light gradient and scattering forces exerted on spheres also increase, which means that the ability to capture and transportation of spheres using nanofiber increases with the laser wavelength. The experimental phenomena and theoretical predictions are completely consistent with each other, when the lasers with three wavelengths are separately injected into the fiber with a diameter of 600 nm, with the increase of the wavelength, the critical power becomes small, and when the laser power is constant, with the increase of the wavelength, velocities of spheres also increase, showing that the ability to capture and transport the microsheres is enhanced.