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超分辨技术因其可以超越经典的衍射极限而为人们所熟知,并且在光存储和共焦扫描成像系统中有着广泛的应用。把由两个偏振器和一个圆对称的双折射元件组成的径向双折射滤波器引入超分辨技术,借助琼斯算法推导出其光瞳函数的表达式。由分析得出通过改变径向双折射滤波器中偏振器的偏振方向和双折射元件的主轴之间的夹角,即可实现光学系统的横向超分辨或轴向超分辨。同时对评价该器件超分辨性能的参量第一零点比、斯特尔比和旁瓣强度抑制比做了详细的讨论。该滤波器用于超分辨技术的优点在于其制作不涉及相位的变化而比较简单,且费用比较低。缺点是旁瓣能量过高,但可以通过采用共焦系统来抑制。
Super-resolution technology is well-known for its ability to exceed classical diffraction limits and has wide applications in optical storage and confocal scanning imaging systems. A radial birefringent filter consisting of two polarizers and a circularly symmetric birefringent element is introduced into the super-resolution technique. The expression of the pupil function is deduced from the Jones algorithm. The analysis shows that by changing the polarization direction of the polarizer in the radial birefringent filter and the angle between the major axis of the birefringent element, the transverse superresolution or the axial superresolution of the optical system can be realized. At the same time, the first zero-point ratio, the Strobel ratio and the sidelobe intensity rejection ratio were evaluated in detail to evaluate the super-resolution performance of the device. The advantage of using this filter in super-resolution technology is that it is relatively simple and inexpensive to produce without making any changes to the phase. The disadvantage is that the sidelobe energy is too high, but can be suppressed by using a confocal system.