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介绍了遗传算法在设计宽频带全能反射器中的应用.设计的关键是通过遗传算法寻找到不同一维准周期光子晶体间的最佳组合方式以及光学厚度以便形成一个光子晶体异质结.利用传输矩阵法分析了一维准周期系统中的电磁传输特性.计算结果表明,准周期光子晶体的全方向反射带宽受晶胞单元以及周期数的影响.根据这些规律,用遗传算法成功地优化了光子晶体异质结的结构并得到两种适用于可见光波段的高性能全能反射器.例如结构为(HLLHL)13(HL)13(LHL)15[注:nL=1.46,nH=2.6,dL=0.218λ0/nL且dH=0.201λ0/nH]的反射器在可见光波段内的全方向反射带宽达到了88.42%(446nm～779nm).
The application of genetic algorithm in the design of wideband all-round reflector is introduced.The key of the design is to find out the best combination of different one-dimensional quasi-periodic photonic crystals by genetic algorithm and the optical thickness in order to form a photonic crystal hetero-junction The transmission matrix method is used to analyze the electromagnetic transmission characteristics in a one-dimensional quasi-periodic system. The calculated results show that the omnidirectional reflection bandwidth of quasi-periodic photonic crystals is affected by the number of unit cells and the number of cycles. According to these rules, (HLLHL) 13 (HL) 13 (LHL) 15 [Note: nL = 1.46, nH = 2.6, dL = 0.218λ0 / nL and dH = 0.201λ0 / nH], the total reflection bandwidth in the visible band reaches 88.42% (446nm ~ 779nm).