Band gaps structure and semi-Dirac point of two-dimensional function photonic crystals

Zhang Si-Qi¹, Lu Jing-Bin¹, Liang Yu², Ma Ji², Li Hong³, Li Xue¹, Liu Xiao-Jing², Wu Xiang-Yao^{2, †}, Meng Xiang-Dong²

The band gaps structure of two-dimensional conventional photonic crystals for the triangle lattice, , , medium column radius . (a) TE wave, (b) TM wave.