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Journal of Russian Laser Research

, Volume 34, Issue 5, pp 468–476 | Cite as

A Highly Efficient Superresolving Phase Filter for a Radially Polarized Beam

  • Huifang Chen
  • Huimin Yan
  • Zhihua Ding
  • Xiuda Zhang
Article
  • 63 Downloads

Abstract

We simulate the focal intensity distribution of a radially polarized beam, in view of the vector diffraction theory. We summarize two important rules: (i) the marginal ray of the aperture determines the focal size on the focal plane; (ii) the ratio of the longitudinal component to the transversal component affects the shape of the focus. We design a continuous phase filter using these rules for a confocal system. We chose the tangent of the semi-aperture angle to build up the phase function, because it is sensitive to the marginal rays, which have large aperture angles. To achieve a flexible modulation, we use a quadratic function for unwrapping the phase. We optimize the parameters of the quadratic function and achieve a transverse superresolving focus. Aiming at different Strehl ratios, we obtain a series of superresolution phase filters. Compared with others, the filter proposed has the advantages of superior superresolution effect and higher energy utilization ratios. The phase-filter design is universal and proved to be valid. It can be employed in either high or low NA systems, superresolving or donut focus applications.

Keywords

superresolution radial polarization confocal microscope phase filter 

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Huifang Chen
    • 1
    • 2
  • Huimin Yan
    • 1
  • Zhihua Ding
    • 1
  • Xiuda Zhang
    • 1
  1. 1.State Key Laboratory of Modern Optical InstrumentationsZhejiang UniversityHangzhouChina
  2. 2.College of Optical and Electronic TechnologyChina Jiliang UniversityHangzhouChina

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