GRADIENT FIELD MICROSCOPY OF UNSTAINED SPECIMENS: REPLY TO COMMENT, OPT. EXP. 21 (16), 19188 (2013).

T. KIM, S. SRIDHARAN, AND G. POPESCU
2013

We reply to the comment written by Ferrari and Ayubi on our recent paper, Kim et al. [Opt. Express, 20, 6737 (2012)]. We maintain that our use of Fourier filtering methods lead to valuable intrinsic contrast live cell imaging. Judging by their comments regarding the limit sin(x)~x, it seems that the authors overlooked Fig. 2 in our paper, where we show results with sinusoidal masks of different periods.