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<p>Cylindrical vector beams have attracted significant attention due to their unique polarization characteristics and their ability to generate strong longitudinal field components under tight focusing conditions. In this work, we investigate the focal field distribution of a phase-modulated cylindrical vector beam using the Richards–Wolf vector diffraction theory. The influence of phase modulation on the electric field components in the focal region is analyzed in detail. Numerical simulations reveal that the phase modulation significantly modifies the focal spot structure and enhances the longitudinal electric field component. The results demonstrate that appropriate phase engineering can be used to control the focal field distribution, which may be useful for applications in optical trapping, high-resolution microscopy, and nano-optics.</p>

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Tight focusing properties of transversely polarized beam

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • D. Thiruarul,
  • K. B. Rajesh,
  • M. Saravanan

摘要

Cylindrical vector beams have attracted significant attention due to their unique polarization characteristics and their ability to generate strong longitudinal field components under tight focusing conditions. In this work, we investigate the focal field distribution of a phase-modulated cylindrical vector beam using the Richards–Wolf vector diffraction theory. The influence of phase modulation on the electric field components in the focal region is analyzed in detail. Numerical simulations reveal that the phase modulation significantly modifies the focal spot structure and enhances the longitudinal electric field component. The results demonstrate that appropriate phase engineering can be used to control the focal field distribution, which may be useful for applications in optical trapping, high-resolution microscopy, and nano-optics.