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 band structures of 2D FPCs with the triangle lattices, where ε_b = 1, ε_a = kr + 9, k = 1.8 × 10⁶, and r_a = 0.26a. (a) TE wave, (b) TM wave.