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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 16 — Aug. 12, 2013
  • pp: 19187–19187

Gradient field microscopy of unstained specimens: comment

José A. Ferrari and Gastón A. Ayubi  »View Author Affiliations

Optics Express, Vol. 21, Issue 16, pp. 19187-19187 (2013)

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We comment on a recent paper by Kim et al. [Opt. Exp. 20(6) 6737-6745 (2012)], in which the authors claimed to present a new method for first-order differentiation of phase objects called gradient field microscopy (GFM). We consider that the method does not substantially differ from well-known Fourier methods discussed in textbooks. Also, we discuss some deficiencies of the paper.

© 2013 OSA

OCIS Codes
(170.0180) Medical optics and biotechnology : Microscopy
(170.1650) Medical optics and biotechnology : Coherence imaging

ToC Category:
Medical Optics and Biotechnology

Original Manuscript: November 21, 2012
Revised Manuscript: February 7, 2013
Manuscript Accepted: April 25, 2013
Published: August 5, 2013

Virtual Issues
Vol. 8, Iss. 9 Virtual Journal for Biomedical Optics

José A. Ferrari and Gastón A. Ayubi, "Gradient field microscopy of unstained specimens: comment," Opt. Express 21, 19187-19187 (2013)

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  1. T. Kim, S. Sridharan, and G. Popescu, “Gradient field microscopy of unstained specimens,” Opt. Express20(6), 6737–6745 (2012). [CrossRef] [PubMed]
  2. S. K. Yao and S. H. Lee, “Spatial differentiation and integration by coherent optical-correlation method,” J. Opt. Soc.61(4), 474–477 (1971). [CrossRef]
  3. J.K.T. Eu, C.Y.C. Liu, and A.W. Lohmann, “Spatial filters for differentiation,” Opt. Comm. 9(2), 168-171 (1973).
  4. G. O. Reynolds, J. B. DeVelis, G. B. Parrent, Jr., and B. J. Thompson, eds., The New Physical Optics Notebook: Tutorials in Fourier Optics (SPIE, 1989), Chap. 32.

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