Hou Jin, Zhou Yusen, Citrin D S, Qiu Xuejun, Yang Chunyong, Chen Shaoping
Opt Lett. 2021 Nov 15;46(22):5558-5561. doi: 10.1364/OL.440763.
We find that in a suitably designed photonic crystal (PC) certain high-order photonic bands are less affected by the refractive-index ratio (RIR) than low-order bands, enabling the realization of a robust and complete two-dimensional (2D) photonic bandgap in a moderate refractive-index-ratio PC. A detailed theoretical investigation of low- and high-order bandgaps in a series of PCs with different configurations is performed that shows that high-order bands may favor substantial complete photonic bandgaps (CPBGs) for systems with a moderate RIR. Furthermore, the importance of the geometry and structural parameters on achieving a high-order CPBG is found. Specifically, a hexagonal lattice PC of annular-hole-peripheral connecting rods is proposed, which can support a CPBG with a refractive-index ratio (RIR) as low as :=2.1; to the best of our knowledge, this is the lowest RIR used to obtain a 2D CPBG in a PC.
我们发现，在一个经过适当设计的光子晶体（PC）中，某些高阶光子带比低阶带受折射率比（RIR）的影响更小，这使得在适度折射率比的PC中能够实现稳健且完整的二维（2D）光子带隙。对一系列具有不同配置的PC中的低阶和高阶带隙进行了详细的理论研究，结果表明，对于具有适度RIR的系统，高阶带可能有利于形成大量完整的光子带隙（CPBG）。此外，还发现了几何形状和结构参数对于实现高阶CPBG的重要性。具体而言，提出了一种环形孔周边连接杆的六角晶格PC，它可以支持折射率比（RIR）低至 :=2.1的CPBG；据我们所知，这是在PC中用于获得2D CPBG的最低RIR。
