Demonstration of flat-top focusing under radial polarization illumination

Hao Chen, Santosh Tripathi, Kimani C. Toussaint

Research output: Contribution to journalArticlepeer-review

Abstract

We experimentally demonstrate the generation of a flat-top intensity distribution using a radially polarized vector beam. Our approach uses higher numerical aperture focusing than what has been previously reported for a single, fixed, vector beam. In addition, the flat-top focus generated in our scheme exhibits a polarization gradient along the radial coordinate in the focal volume, with an on-axis longitudinal field component that persists over 2λ, which is a stark difference from conventional flat-top fields, which exhibit intensity profiles that are uniformly polarized. Our experimental results are found to be in good agreement with the theoretical prediction.

Original languageEnglish (US)
Pages (from-to)834-837
Number of pages4
JournalOptics Letters
Volume39
Issue number4
DOIs
StatePublished - Feb 15 2014

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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