Research On Far-ifeld Optical Super-resolution With Phase Pupil Filters

Whether to fulfill the human desire to explore the unknown world, or tosatisfy the needs of modern engineering technology, high-resolution imaging is avery important research subject. One of the most valuable goals in this field is tobreak the barrier of optical diffraction-limit. It is no doubt that the opticalsuper-resolution technology is the primary method to achieve this goal.Based on a detailed summary of the history and current research onsuper-resolution, the apodization technique which belongs to far-field opticalsuper-resolution technology is chosen as the main research direction. Furthermore,our research focuses on the super-resolving optical pupil filter to achieveapodization.The research theoretical basis is diffraction optics. Based on the theories, theanalytical models of evaluation parameters on super-resolution filter are established,and the effect on imaging with continuous phase optical pupil filter in optical systemis analyzed. In view of some blind spots in superresolving phase filters study, adesign of phase filter with polynomial function is proposed and finished byusing mathematical software MATLAB. With this filter, three-dimensionalsuper-resolution can be obtained in optical system.The contrast with the effects on resolution of a typical three-zone phase opticalpupil filter is shown in the last part of the dissertation. By comparing, there is asignificant improvement on transverse resolution with the new type filter, but theStrehl ratio will decline. In addition, more adjustable parameters could be establishedto restrain such a filter by increasing the highest power of the polynomial function,which makes the filter more flexible in improving the resolution of optical system.The numerical results about the optical pupil filter with polynomial functions willalso help the manufacture.