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对二维三角形空气孔结构的光子晶体TE模、TM模的禁带重叠区,即绝对带隙的影响因素进行了系统的分析计算,得到其禁带随介电常数的差别还有填充比的变化规律:绝对带隙在r/d(空气孔半径/晶格周期)>0.4时出现,带隙宽度随r/d的增加而增加,到r/d=0.483时达到最大,往后开始减小。其中带隙中心频率值随r/d的增加而增加;把填充比r/d固定在0.483,计算绝对带隙宽度随背景材料的介电常数ε的变化规律发现:绝对带隙在背景材料的介电常数ε>8的时候出现,宽度随ε的增加而增加。
The two-dimensional triangular air-hole structure of the photonic crystal TE mode, TM mode band gap, that is, the absolute bandgap of the influencing factors were systematically calculated and calculated its band gap with the permittivity difference and the filling ratio Variation: The absolute bandgap appears at r / d (air hole radius / lattice period)> 0.4. The bandgap width increases with r / d and reaches the maximum at r / d = 0.483, small. The value of bandgap center frequency increases with the increase of r / d. The filling ratio r / d is fixed at 0.483, and the law of the absolute bandgap width with the permittivity ε of the background material is calculated. The absolute band gap is found in the background material When the dielectric constant ε> 8 appears, the width increases with the increase of ε.