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Applied Physics B

, Volume 72, Issue 1, pp 109–113 | Cite as

The focus of light – theoretical calculation and experimental tomographic reconstruction

  • S. Quabis
  • R. Dorn
  • M. Eberler
  • O. Glöckl
  • G. Leuchs
Article

Abstract.

We present numerical calculations on the field distribution in the focus of an optical system with high numerical aperture. The diffraction integrals which are based on the Debye approximation are derived and evaluated for a radially polarized input field with a doughnut-shaped intensity distribution. It is shown that this mode focusses down to a spot size significantly smaller as compared to the case of linear polarization. An experimental setup to measure the three-dimensional intensity distribution in the focal region is presented, which is based on the knife-edge method and on tomographic reconstruction.

PACS: 42.15.Dp; 42.25.Ja; 42.30.Wb 

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Copyright information

© Springer-Verlag 2000

Authors and Affiliations

  • S. Quabis
    • 1
  • R. Dorn
    • 1
  • M. Eberler
    • 1
  • O. Glöckl
    • 1
  • G. Leuchs
    • 1
  1. 1.Physics Department, Chair for Optics, University Erlangen–Nürnberg, Staudtstr. 7/B2, 91058 Erlangen, Germany (E-mail: leuchs@physik.uni-erlangen.de)DE

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