A Switching Mechanism Based on Photonic Quantum-well Effects
基于量子阱效应的光开关

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.