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首页> 外文期刊>Journal of Modern Optics >High-aperture focusing systems: control of light concentration in focal region by pupil filtering
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High-aperture focusing systems: control of light concentration in focal region by pupil filtering

机译:高光圈聚焦系统:通过瞳孔过滤来控制聚焦区域的光聚集

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摘要

The influence of various pupil filters on the field distribution in the neighbourhood of focus within the context of the vector diffraction theory is reviewed. The principal issue is with the focal depth via the calculations of integral parameters: encircled electric energy and encircled longitudinal electromagnetic energy flow along the optical axis. It is shown that in the case of filters which change the phase, the integral parameters for small radii attain their own maximum values not in the geometrical focal plane, but in the plane which is displaced from the latter by a certain distance. The encircled electric energy and the encircled longitudinal flux have maximum values in the focal plane only for large radii. For the optimum enhancement of focal depth the most suitable filter, from those under consideration, is the truncated Bessel filter.
机译:在矢量衍射理论的背景下,综述了各种光瞳滤光片对焦点附近场分布的影响。主要问题是通过计算积分参数获得的焦深:沿光轴的环绕电能和环绕纵向电磁能流。结果表明,在改变相位的滤波器的情况下,小半径的积分参数不是在几何焦平面上而是在与之偏离一定距离的平面上达到其自身的最大值。环绕的电能和环绕的纵向通量仅在大半径时在焦平面中具有最大值。为了最佳地提高焦深,在考虑中的最合适的滤光片是截断的Bessel滤光片。

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