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把平面波展开法(Plane Wave Expansion Method,PWM)用于数值研究圆柱柱体粗细及折射率层状间隔构成的二维光子晶体超晶格的传输特性.数值结果表明,层状超晶格的透射谱中禁带宽度在柱体折射率相同时与粗细柱体半径差异成线性关系,半径相差越大禁带宽度越小,禁带中心位置越向低频方向移动·在半径相同时禁带宽度与层间折射率差异同样成线性关系,折射率相差越大禁带宽度越小,禁带中心位置越向低频方向移动·因此人们可以根据实际应用中的禁带需要利用上述各种可调因素进行调节·
Plane Wave Expansion Method (PWM) is used to numerically study the propagation characteristics of a two-dimensional photonic crystal superlattice consisting of a cylindrical cylinder and a refractive index layered spacer. The numerical results show that the transmission of the layered superlattice The band gap in the spectrum has a linear relationship with the difference of the radius of the thick cylinder when the refractive index of the cylinder is the same. The larger the difference of the radii, the smaller the band gap, the more the center of the band shifts to the lower frequency. The difference in refractive index between layers is also linear, and the larger the difference in refractive index, the smaller the width of the forbidden band, the more the center of the forbidden band moves toward the low frequency. Therefore, one can use the above tunable factors according to the forbidden band in practical applications adjust·