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<p>Axially splitted multifoci(AMF) are numerically generated by tight focusing of higher order cylindrical vector beam (HCVB) through an annular Walsh filter. Here, we report that by properly manipulating the parameters of HCVB such as initial phase(<i>φ</i><sub><i>0</i></sub>), topological charge (<i>m</i>), polarization rotation angle or azimuthal index (<i>a</i>) and suitably phase modulating with a Walsh function filter of fixed orders (<i>n</i>) and annular obstruction (<i>ε</i>), one can generate axially polarized multiple spots, transversely polarized multiple holes, transversely polarized multi spots, axially and transversely polarized multi holes with extended central annular region.These distributions may be useful for multiple optical trapping and axial super-resolution microscopy.</p>

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Polarization-controlled axial multi-focal structures generated by higher-order cylindrical vector beams modulated with annular Walsh filters

  • 期刊论文

  • 发表日期：

    2026年4月3日

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  • D. Thiruarul,
  • M. Saravanan,
  • J. William Charles,
  • M. Lavanya,
  • K. B. Rajesh,
  • Z. Jaroszewicz

摘要

Axially splitted multifoci(AMF) are numerically generated by tight focusing of higher order cylindrical vector beam (HCVB) through an annular Walsh filter. Here, we report that by properly manipulating the parameters of HCVB such as initial phase(φ0), topological charge (m), polarization rotation angle or azimuthal index (a) and suitably phase modulating with a Walsh function filter of fixed orders (n) and annular obstruction (ε), one can generate axially polarized multiple spots, transversely polarized multiple holes, transversely polarized multi spots, axially and transversely polarized multi holes with extended central annular region.These distributions may be useful for multiple optical trapping and axial super-resolution microscopy.