基于量子阱效应的光开关

把三块各带有一个缺陷的光子晶体结合起来，如果中央晶体的缺陷模处在两侧晶体的禁带中，缺陷模内的光波会受到两侧晶体的阻碍并被局域在中央晶体内，形成量子阱结构；若一侧晶体的缺陷模被移动到中央晶体缺陷模处，则只有一侧晶体阻碍在中央晶体缺陷模内传播的光波，量子阱效应完全消失，光的传输受到最大程度的阻碍.这种结构可同时具有窄带滤波器和光开关的功能，据此提出了一种高效的、灵敏的光开关的设计.采用传输矩阵法计算了一维光子晶体的透射谱和场分布.

A Switching Mechanism Based on Photonic Quantum-well Effects

Photonic quantum-well (QW) structures can b e constructed by stacking 3 photonic crystals (PCs) with the same photonic band gap and different defect modes. On condition that the defect mode of the PC in t he well region is located into nontransmission frequency ranges of the PCs in th e barrier regions, the confined photonic state appears and can completely transm it through the structure by tunneling. However, its transmission will be strongl y prohibited due to vanishing of the photonic QW induced by shifting the defect mode frequency of either of the PCs in the surrounded regions to that of the mid dle PC. Switching and narrow band filtering can be realized simultaneously with the structure. The theoretical calculation has been carried out by transfer matr ix methods.