Sharper focal spot formed by higher-order radially polarized laser beams

Yuichi Kozawa, Shunichi Sato

Research output: Contribution to journalArticlepeer-review

187 Citations (Scopus)

Abstract

The intensity distributions near the focal point for radially polarized laser beams including higher-order transverse modes are calculated based on vector diffraction theory. For higher-order radially polarized mode beams as well as a fundamental mode (R-TEM01 *) beam, the strong longitudinal component forms a sharper spot at the focal point under a high-NA focusing condition. In particular, double-ring-shaped radially polarized mode (R-TEM11*) beams can effectively reduce the focal spot size because of destructive interference between the inner and the outer rings with π phase shift. Compared with an R-TEM01* beam focusing in a limit of NA = 1, the full width at half-maximum values of the focal spot for an R-TEM11* beam are decreased by 13.6% for the longitudinal component and 25.8% for the total intensity.

Original languageEnglish
Pages (from-to)1793-1798
Number of pages6
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume24
Issue number6
DOIs
Publication statusPublished - 2007 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Vision and Pattern Recognition

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