Vibration and Terahertz Wave Absorption Characteristics of Graphene Material

In this study, theoretical calculation of the molecular vibration frequency of graphene materials in the range of 0.1~10 THz was carried out using density functional theory, and the vibration mode of graphene molecules was analyzed. THz time domain spectrometer was employed to test the absorption spectra of graphene materials in the 0.2~3.5 THz frequency band, and the assignments of the absorption characteristic peaks of graphene were identified respectively. The results show that the graphene material produces resonance absorption of terahertz waves due to the interaction of intramolecular C-C at frequencies around 1.92 THz and 2.11 THz, and the calculated results are highly consistent with the experimental results.