Yang Yuting, Xu Tao, Xu Yun Fei, Hang Zhi Hong
Opt Lett. 2017 Aug 15;42(16):3085-3088. doi: 10.1364/OL.42.003085.
Interface states in photonic crystals provide efficient approaches to control the flow of light. Photonic Zak phase determines the bulk band properties of photonic crystals, and, by assembling two photonic crystals with different bulk band properties together, deterministic interface states can be realized. By translating each unit cell of a photonic crystal by half the lattice constant, another photonic crystal with identical common gaps but a different Zak phase at each photonic band can be created. By assembling these two photonic crystals together, multiband waveguide can thus be easily created and then experimentally characterized. Our experimental results have good agreement with numerical simulations, and the propagation properties of these measured interface states indicate that this new type of interface state will be a good candidate for future applications of optical communications.
光子晶体中的界面态为控制光流提供了有效的方法。光子 Zak 相决定了光子晶体的体带特性，并且通过将具有不同体带特性的两个光子晶体组装在一起，可以实现确定性的界面态。通过将光子晶体的每个晶胞平移半个晶格常数，可以创建另一个具有相同公共带隙但在每个光子带具有不同 Zak 相的光子晶体。通过将这两个光子晶体组装在一起，因此可以轻松创建多波段波导，然后进行实验表征。我们的实验结果与数值模拟有很好的一致性，并且这些测量的界面态的传播特性表明，这种新型界面态将是未来光通信应用的良好候选者。
