Open AccessTransverse superresolution and extended axial focal depth realized by three-zone annular phase pupil filter
Author(s) -
Changhe Zhou,
Junjie Yu,
Wei Wang
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.024201
Subject(s) - optics , transverse plane , numerical aperture , lens (geology) , diffraction , phase (matter) , filter (signal processing) , focal length , exit pupil , aperture (computer memory) , physics , angular aperture , depth of focus (tectonics) , computer simulation , entrance pupil , pupil , geology , mechanics , acoustics , wavelength , paleontology , subduction , structural engineering , quantum mechanics , engineering , computer vision , tectonics , computer science
When linearly polarized light is focused using a high numerical aperture lens with three-zone annular phase pupil filter, vector diffraction method was applied to study the optical intensity distribution in transverse and axial directions. Numerical simulation results show that optical intensity distribution in transverse and axial directions need to be treated simultaneously. When three-zone annular phase pupil filter is added in front of a high numerical aperture lens, transverse super resolution, extended axial focal depth and flat-top focusing can be achieved at the same time. Furthermore, When phase modulation depth is changed, the phenomenon of axial focal shift can be found. The structure of three-zone annular phase pupil filter was optimized and the optimized results were given.