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Focusing properties of elliptical mirror with an aperture angle greater than π

机译：孔径角大于π的椭圆镜的聚焦特性

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摘要

An analytical apodization function of an elliptical mirror with an aperture angle greater than π is derived for the analysis of the focusing properties. The distribution of electric field intensity near the focal region is given using vectorial Debye theory. Simulation results indicate that a bone-shaped focal spot is formed under linearly polarized illumination, and a tight-circularly symmetric spot is generated under radially polarized illumination. The change in eccentricity causes such a change in the focusing pattern under radially polarized illumination, that a greater eccentricity causes a spot tighter in transverse direction but wider in axial direction. Under radially polarized illumination, the transverse and axial full-width-at-half-maximum will be 0.382λ and 0.757λ, respectively, and the conversion efficiency of the longitudinal component can go beyond 99%, when the semi-aperture angle is 2π/3 and the eccentricity is 0.6. It can, therefore, be concluded that the tight focusing pattern with strong and pure longitudinal field can be achieved under radially polarized illumination for particle acceleration, optical tweezers, and high-resolution scanning microscopy.
机译：推导了孔径角大于π的椭圆镜的解析变迹函数，用于分析聚焦特性。使用矢量德拜理论给出了焦点区域附近的电场强度分布。仿真结果表明，在线性偏振光照射下会形成骨形焦点，在径向偏振光照射下会产生紧密的圆形对称点。偏心率的变化在径向偏振照明下引起聚焦图案的这种变化，从而较大的偏心率导致光斑在横向方向上更紧密但在轴向方向上更宽。在半偏振角为2π的情况下，在径向偏振照明下，半最大横向宽度和轴向最大宽度分别为0.382λ和0.757λ，纵向分量的转换效率可以超过99％。 / 3，偏心率为0.6。因此，可以得出结论，在径向偏振照明下，可以利用粒子加速，光镊和高分辨率扫描显微镜获得具有强而纯纵向场的紧密聚焦图案。

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  • 来源
    《Optical engineering》 |2014年第6期|061606.1-061606.6|共6页
  • 作者

    Jian Liu; Min Ai; He Zhang; Jiubin Tan;

  • 作者单位

    Harbin Institute of Technology Center of Ultra-Precision Optoelectronic Instrument Engineering Harbin 150001, China;

    Harbin Institute of Technology Center of Ultra-Precision Optoelectronic Instrument Engineering Harbin 150001, China;

    Harbin Institute of Technology Center of Ultra-Precision Optoelectronic Instrument Engineering Harbin 150001, China;

    Harbin Institute of Technology Center of Ultra-Precision Optoelectronic Instrument Engineering Harbin 150001, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    elliptical mirror; apodization function; linear or radial polarization; conversion efficiency;

    机译：椭圆镜切趾功能;线性或径向极化;转换效率;

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