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首页> 外文期刊>Optical and quantum electronics >Effect of dielectric interface on the tight focusing properties of radially polarized annular multi Gaussian beams
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Effect of dielectric interface on the tight focusing properties of radially polarized annular multi Gaussian beams

机译：介电界面对径向极化环形多高斯光束紧密聚焦性能的影响

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摘要

A super-length optical needle (44λ) of strong transversally polarized field with homogeneous intensity along the optical axis and sub-diffraction beam size (0.48λ) can be generated by focusing a radially polarized beam through a dielectric interface with an annular high numerical aperture (NA) lens. Moreover, the focal shifts induced by the mismatch of the refractive indices across the interface has been found. The dependence of focal shifts and spot size of the focused field on the probe depth and NA of the objective is also analyzed in detail by numerical calculations using vector diffraction theory. Such kind of non-diffracting optical needle may have applications in atom-optical experiments, such as with atom trap and atom switches.
机译：可以通过将径向偏振光束聚焦通过具有环形高数值孔径的介电界面来产生具有沿光轴的均匀强度和次衍射光束尺寸（0.48λ）的强横向偏振场的超长光学针（44λ） （NA）镜头。而且，已经发现了由跨界面的折射率的不匹配引起的焦点偏移。利用矢量衍射理论通过数值计算，还详细分析了焦点偏移和聚焦场的光斑大小与物镜的探针深度和NA的关系。这种非衍射光学针可能会在原子光学实验中应用，例如使用原子陷阱和原子开关。

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