This is a comment in response to the claims made in a recent paper by Zhang and Ding [Opt. Express 17, 22235-22239 (2009)]. The authors claimed that an error has been found in a previous paper [Opt. Express 12, 3377-3382 (2004)] and provided a “guess” of how the Poynting vector was calculated. These claims are incorrect and are based on a misconception.

© 2010 OSA

1. Y. Zhang and B. Ding, “Magnetic field distribution of a highly focused radially-polarized light beam,” Opt. Express 17(24), 22235–22239 (2009). [CrossRef] [PubMed]
2. Q. Zhan, “Trapping metallic Rayleigh particles with radial polarization,” Opt. Express 12(15), 3377–3382 (2004). [CrossRef] [PubMed]
3. K. Youngworth and T. Brown, “Focusing of high numerical aperture cylindrical-vector beams,” Opt. Express 7(2), 77–87 (2000). [CrossRef] [PubMed]
4. B. Richards and E. Wolf, “Electromagnetic diffraction in optical systems II. Structure of the image field in an aplanatic system,” Proc. R. Soc. Lond. A Math. Phys. Sci. 253(1274), 358–379 (1959). [CrossRef]

Brown, T.
Ding, B.
Richards, B.
Wolf, E.
Youngworth, K.
Zhan, Q.
Zhang, Y.

Opt. Express

• Y. Zhang and B. Ding, “Magnetic field distribution of a highly focused radially-polarized light beam,” Opt. Express 17(24), 22235–22239 (2009). [CrossRef] [PubMed]
• Q. Zhan, “Trapping metallic Rayleigh particles with radial polarization,” Opt. Express 12(15), 3377–3382 (2004). [CrossRef] [PubMed]
• K. Youngworth and T. Brown, “Focusing of high numerical aperture cylindrical-vector beams,” Opt. Express 7(2), 77–87 (2000). [CrossRef] [PubMed]

Proc. R. Soc. Lond. A Math. Phys. Sci.

• B. Richards and E. Wolf, “Electromagnetic diffraction in optical systems II. Structure of the image field in an aplanatic system,” Proc. R. Soc. Lond. A Math. Phys. Sci. 253(1274), 358–379 (1959). [CrossRef]

2009, Zhang, Opt. Express
2004, Zhan, Opt. Express
2000, Youngworth, Opt. Express
1959, Richards, Proc. R. Soc. Lond. A Math. Phys. Sci.

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