Comment on “Band gaps structure and semi-Dirac point of two-dimensional function photonic crystals” by Si-Qi Zhang <i>et al</i>.<xref rid="cpb_27_1_014205_fn1" ref-type="fn">*</xref> <fn id="cpb_27_1_014205_fn1"> <label>*</label> <p>Project supported by the Special Grade of the Financial Support from the China Postdoctoral Science Foundation (Grant No. 2016T90455), the China Postdoctoral Science Foundation (Grant No. 2015M581790), and the Chinese Jiangsu Planned Projects for Postdoctoral Research Funds, China (Grant No. 1501016A).</p> </fn>

Comment on “Band gaps structure and semi-Dirac point of two-dimensional function photonic crystals” by Si-Qi Zhang et al.* *

Project supported by the Special Grade of the Financial Support from the China Postdoctoral Science Foundation (Grant No. 2016T90455), the China Postdoctoral Science Foundation (Grant No. 2015M581790), and the Chinese Jiangsu Planned Projects for Postdoctoral Research Funds, China (Grant No. 1501016A).

Zhang Hai-Feng^{1, 2, †}

(color online) The calculated dispersion curves of the 2D PCs with square lattices by different methods: (a) the PWE method based on Monte Carlo method and FDFD method, (b) the approach in Ref. [1].