【摘 要】
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Recently, Zhang et al. (Chin. Phys. B 26024208 (2017)) investigated the band gap structures and semi-Dirac point of two-dimensional function photonic crystals,
【机 构】
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College of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications, Nanjing 2
论文部分内容阅读
Recently, Zhang et al. (Chin. Phys. B 26024208 (2017)) investigated the band gap structures and semi-Dirac point of two-dimensional function photonic crystals, and the equations for the plane wave expansion method were induced to obtain the band structures. That report shows the band diagrams with the effects of function coefficient k and medium column ra under TE and TM waves. The proposed results look correct at first glance, but the authors made some mistakes in their report. Thus, the calculated results in their paper are incorrect. According to our calculations, the errors in their report are corrected, and the correct band structures also are presented in this paper.
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