Focusing of a femtosecond vortex light pulse through a high numerical aperture objective

Baosuan Chen, Jixiong Pu, Olga Korotkova

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

We investigate the focusing properties of a femtosecond vortex light pulse focused by a high numerical aperture objective. By using the Richards-Wolf vectorial diffraction method, the intensity distribution, the velocity variation and the orbital angular momentum near the focus are studied in great detail. We have discovered that the femtosecond vortex light pulse can travel at various speeds, that is, slower or faster than light with a tight focusing system. Moreover, we have found that the numerical aperture of the focusing objective and the duration of the vortex light pulse will influence the orbital angular momentum distribution in the focused field.

Original languageEnglish (US)
Pages (from-to)10822-10827
Number of pages6
JournalOptics Express
Volume18
Issue number10
DOIs
StatePublished - May 10 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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