Abstract

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.

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References

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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.

2012 (1)

1973 (1)

J.K.T. Eu, C.Y.C. Liu, and A.W. Lohmann, “Spatial filters for differentiation,” Opt. Comm. 9(2), 168-171 (1973).

1971 (1)

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]

Eu, J.K.T.

J.K.T. Eu, C.Y.C. Liu, and A.W. Lohmann, “Spatial filters for differentiation,” Opt. Comm. 9(2), 168-171 (1973).

Kim, T.

Lee, S. H.

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]

Liu, C.Y.C.

J.K.T. Eu, C.Y.C. Liu, and A.W. Lohmann, “Spatial filters for differentiation,” Opt. Comm. 9(2), 168-171 (1973).

Lohmann, A.W.

J.K.T. Eu, C.Y.C. Liu, and A.W. Lohmann, “Spatial filters for differentiation,” Opt. Comm. 9(2), 168-171 (1973).

Popescu, G.

Sridharan, S.

Yao, S. K.

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]

J. Opt. Soc. (1)

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]

Opt. Comm (1)

J.K.T. Eu, C.Y.C. Liu, and A.W. Lohmann, “Spatial filters for differentiation,” Opt. Comm. 9(2), 168-171 (1973).

Opt. Express (1)

Other (1)

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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