周期性结构的石墨烯对太赫兹波的吸收特性研究

Study on absorptivity of graphene with periodic structures for terahertz wave

针对在六角孔形周期性结构阵列铜网上生长而成的石墨稀,对其在太赫兹波段的吸收进行了研究与讨论.用太赫兹时域光谱搞合系统对石墨稀样品进行检测,检测结果表明,在O. 7-1. 4 T H Z范围内,因石墨稀样品含有的杂质增强了对太赫兹波的吸收,进而增大了整体的吸收率,所以片状石墨稀样品的吸收率约为4 % ,比以往文献中记载的2.3% 高.因部分太赫兹波被石墨稀周期性结构形成的等离子带吸收,还有少部分太赫兹波被周期性结构干涉和散射,周期性结构石墨稀的吸收率增大了约1.5倍.

The absorptivity of graphene with periodic structures is studied and discussed in the terahertz range.The experimental results show that the absorptivity of graphene sheet sample in the range of 0.7-1.4THz is about 4%,which is higher than 2.3%recorded in literatures.The reason may be that the prepared graphene containing impurities which absorb some terahertz wave leads to the overall increase of the absorptivity.The absorptivity of graphene with periodic structures increases by about 1.5times.The reason is that part of terahertz wave is absorbed by special plasmonic bands due to the periodic structures of graphene and part of terahertz wave is involved in interference and scattering by periodic structures of graphene.The results have important implication for the development of terahertz wave modulation and detection devices.