遗传算法优化设计三角晶格光子晶体

将遗传算法应用于三角晶格光子晶体的禁带设计过程. 考虑到可制备性，算法以第五能级下最大绝对禁带为优化目标，采用粗粒度像素表示原胞结构. 通过引入傅里叶变换数据备份机制以提高禁带计算速度和算法效率，从而快速搜索到了具有较大绝对禁带的“介质空气柱”散射体形状的三角晶格光子晶体，其最大绝对禁带的相对宽度值(绝对禁带宽度和中心高度的比值)为23.8%. 关键词： 二维光子晶体 三角晶格 光子带隙 遗传算法

Design of triangular lattice photonic crystals using genetic algorithms

Genetic Algorithms (GAs) were used to design triangular lattice photonic crystals with large absolute band-gap. Considering fabricating issues, the algorithms represented the unit cell with large pixels and took the largest absolute band-gap under the fifth band as the objective function. By integrating Fourier transform data storage mechanism, the algorithms ran efficiently and effectively and optimized a triangular lattice photonic crystal with scatters in the shape of ‘dielectric-air rod'. It had a large absolute band gap with relative width (ratio of gap width to midgap) 23.8%.