We found an obvious mismatch between a statement in the main text and the corresponding figure (Figs. 8(a) and 8(b)) in paper [Opt. Express 24, 29537 (2016). [CrossRef] [PubMed] ]. In page 9, there is a sentence: “The observation lines can be seen in the inserts in Figs. 8(a)-8(c). As can be seen, the potential lines along the lines x = 10 mm and x = −10 mm are straight, which means that no distortion for the external field occurs”. However, the potential lines along the lines x = 10 mm and x = −10 mm in the Figs. 8(a) and 8(b) are not straight obviously, and the wrong results have been used inadvertently. This mistake may occur in the process of revising or publication. It should be noted that our sentence or statement is right and the corresponding figure is corrected.
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