The photonic crystal is an artificial microstructure, which is composed of different dielectric constant materials periodically arranged. Periodically modulated dielectric constant makes photonic crystal show various band structures. Among them, the flat band of photonic crystal has attracted great attention due to its non-dispersive property. Here, taking the two-dimensional square lattice dielectric column photonic crystal as an example, the influence factor of dielectric constant ratio on flat band is numerically explored using the finite element method. These results show that flat band with better flatness can be also obtained by reducing the dielectric constant around the column, which provide a new approach to obtain and further study the nearly flat bands of photonic crystal.
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张婷,康明. 介电常数对比度对光子晶体平带的影响[J]. 科学技术与工程, 2021, 21(2): 442-446. Zhang Ting, Kang Ming. The effect of dielectric constant contrast on the flat band of photonic crystal[J]. Science Technology and Engineering,2021,21(2):442-446.