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Velocity property of an optical chain generated by the tightly focused femtosecond radially polarization pulse

机译：由紧密的FemtoSecond径向极化脉冲产生的光链的速度特性

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摘要

Based on the Richards-Wolf vector diffraction integration, we obtained the expressions of the intensity and velocity of femtosecond radially polarized pulses at the focus near a dielectric interface, and the pulses are modulated by an optical system consisting of diffractive optical elements (DOEs) and a high numerical aperture (NA) lens. The factors that affected the intensity distribution and velocity evolution of the three-dimensional optical capture structural pulse (optical chain) are also analyzed. These factors include the DOE structural parameters (bandwidth, phase difference between the rings), the interception ratio of incident beam, the NA, the central wavelength of pulses, and the refractive index of exiting medium. The results show that the velocity of the optical chain will increase with an increase in the DOE bandwidth or a decrease in the refractive index of the exiting medium, and the maximum of the optical chain velocity will decrease versus the NA. Furthermore, the dependence of the optical chain velocity on its intensity distribution is also revealed. The superluminal and subluminal can also be found during the propagation of the optical chain. The velocity distribution difference between bright and dark areas along the z axis is more conducive to distinguishing the trapping of the Rayleigh particles. We believe these interesting results have great potential to improve the space-time resolution to detect particle positions during high-speed optical trapping. (C) 2021 Optical Society of America
机译：基于Richards-Wolf矢量衍射积分，我们得到了飞秒径向偏振脉冲在介质界面附近焦点处的强度和速度表达式，脉冲由衍射光学元件（DO）和高数值孔径（NA）透镜组成的光学系统调制。分析了影响三维光捕获结构脉冲（光链）强度分布和速度演化的因素。这些因素包括DOE结构参数（带宽、环之间的相位差）、入射光束的截获比、NA、脉冲的中心波长以及出射介质的折射率。结果表明，随着DOE带宽的增加或出射介质折射率的降低，光链的速度将增加，并且光链速度的最大值将随着NA的减小而减小。此外，还揭示了光链速度与其强度分布的关系。在光链的传播过程中也可以发现超光速和亚光速。亮区和暗区沿z轴的速度分布差异更有利于区分瑞利粒子的俘获。我们相信，这些有趣的结果有很大的潜力，可以提高在高速光学捕获过程中检测粒子位置的时空分辨率。（2021）美国光学学会

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  • 来源
    《Applied optics》 |2021年第8期|共8页
  • 作者

    Li Dong; Chen Xin; Yang Zhe; Zhang Wei; Zhao Jianlin;

  • 作者单位

    Northwestern Polytech Univ Sch Phys Sci &

    Technol MOE Key Lab Mat Phys &

    Chem Extraordinary Condit Xian 710129 Peoples R China;

    Northwestern Polytech Univ Sch Phys Sci &

    Technol MOE Key Lab Mat Phys &

    Chem Extraordinary Condit Xian 710129 Peoples R China;

    Northwestern Polytech Univ Sch Phys Sci &

    Technol MOE Key Lab Mat Phys &

    Chem Extraordinary Condit Xian 710129 Peoples R China;

    Northwestern Polytech Univ Sch Phys Sci &

    Technol MOE Key Lab Mat Phys &

    Chem Extraordinary Condit Xian 710129 Peoples R China;

    Northwestern Polytech Univ Sch Phys Sci &

    Technol MOE Key Lab Mat Phys &

    Chem Extraordinary Condit Xian 710129 Peoples R China;

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  • 正文语种 eng
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