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Realization of a subwavelength focused spot without a longitudinal field component in a solid immersion lens-based system

机译：在基于固体浸没透镜的系统中没有纵向场分量的亚波长聚焦点的实现

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摘要

In a solid immersion lens (SIL)-based system, we predict theoretically that, by using the illumination of an azimuthally polarized beam with helical phase (APH), the subwavelength focusing can be simultaneously realized both in SIL and the third medium in spite of the presence of an air gap between the SIL and the third medium, which is not easily achieved in the case of the illumination of linearly, circularly, and radially polarized beams. For the APH illumination, the field in the focal region of the multilayered medium has no longitudinal component, and the on-axis intensity of the focused spot is nonzero. The APH illumination extends the capacity of SIL in realizing a supersmall focused spot, which is useful in microscopy, near-field optics, recording optics, and lithographic optics.
机译：在基于固体浸没透镜（SIL）的系统中，我们从理论上预测，通过使用螺旋相位（APH）的方位角偏振光束的照明，尽管存在以下缺点，仍可以同时在SIL和第三种介质中实现亚波长聚焦SIL和第三种介质之间存在气隙，这在照射线性，圆形和径向偏振光束时不容易实现。对于APH照明，多层介质的焦点区域中的场没有纵向分量，并且焦点的轴上强度不为零。 APH照明扩展了SIL实现超小聚焦点的能力，这在显微镜，近场光学，记录光学和光刻光学中很有用。

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