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Formation of optical needle by high NA lens axicon with dedicated complex spiral phase mask

机译:高NA透镜轴锥和专用复杂螺旋相位掩模形成光针

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摘要

The intensity distribution in the focal region for the tightly focused an azimuthally polarized beam using spiral phase mask and complex phase mask with high NA lens axicon system is studied on the basis of the vector diffraction theory. Here we report a new method that generates optical needle like transversally polarized beam with sub diffraction spot size (0.39 λ) and propagates without divergence over a long distance (of about 15.8 λ) in free space for NA = 0.95. The authors expect such investigation is worthwhile for optical manipulation, beam shaping and optical trapping applications.
机译:在矢量衍射理论的基础上,研究了利用螺旋相位掩模和复相位掩模以及高NA透镜轴棱锥系统紧紧聚焦方位偏振光束的焦点区域的强度分布。在这里,我们报告了一种新的方法,该方法生成具有亚衍射光斑大小(0.39λ)的横向偏振光束的光针,并在NA = 0.95的情况下在自由空间中漫长距离(约15.8λ)内传播而没有发散。作者期望这种研究对于光学操纵,光束整形和光学陷波应用是值得的。

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