Axial irradiance distribution throughout the whole space behind an annular aperture: comments.

Alfredo Dubra // Publications // Jul 01 2003

PubMed ID: 12868810

Author(s): Ferrari JA, Dubra A. Axial irradiance distribution throughout the whole space behind an annular aperture: comments. Appl Opt. 2003 Jul 1;42(19):3754-5; discussion 3792-4. PMID 12868810

Journal: Applied Optics, Volume 42, Issue 19, Jul 2003

We comment on the recent paper by Harvey and Krywonos [Appl. Opt. 41, 3790-3795 (2002)], in which approximate irradiance calculations along the axis of a circular aperture illuminated by a plane wave are performed. As the starting point of their calculations, an approximated version (valid for z >> lambda) of the Rayleigh-Sommerfeld diffraction integral is used. They based their numerical conclusions on a misleading “near field criterion,” which guides the readers to the wrong idea that their calculations are valid even for the very near field behind the aperture. Their ideas are not original; the exact calculations of diffracted fields behind a circular aperture have been known for 40 years.