Broadband THz absorbers based on graphene and 1-D photonic crystal

In order to obtain broadband high efficiency optical absorbers, the composite structure of graphene and 1-D photonic crystal was designed. The modified transfer matrix method was used to study the transmission characteristics. The results show that under certain conditions, the composite structure has a certain bandwidth and high efficiency absorption band in the terahertz band. The position and width of absorption band are consistent with the pass band of 1-D photonic crystal. In some special absorption bands, absorption peak reaches 1. For the same structure, absorption is also related to the incident direction. The combination of grapheme and 1-D photonic crystals further expands the range of applications.