Dong H M, Xu W, Peeters F M
Opt Express. 2018 Sep 17;26(19):24621-24626. doi: 10.1364/OE.26.024621.
Recent experimental work on the application of graphene for novel illumination motivated us to present a theoretical study of the blackbody radiation emission from a freely suspended graphene driven by a dc electric field. Strong terahertz (THz) emission, with intensity up to mW/cm, can be generated with increasing electric field strength due to the heating of electrons in graphene. We show that the intensity of the THz emission generated electrically from graphene depends rather sensitively on the lattice temperature in relatively weak electric fields, whereas it is less sensitive to the lattice temperature in relative strong electric fields. Our study highlights the practical application of graphene as intense THz source where the radiation is generated electrically.
近期关于石墨烯在新型照明领域应用的实验工作促使我们开展一项理论研究，即对由直流电场驱动的自由悬浮石墨烯的黑体辐射发射进行研究。由于石墨烯中电子的加热，随着电场强度的增加，可产生强度高达mW/cm的强太赫兹（THz）辐射。我们表明，在相对较弱的电场中，由石墨烯电产生的太赫兹辐射强度对晶格温度相当敏感，而在相对较强的电场中，它对晶格温度不太敏感。我们的研究突出了石墨烯作为通过电产生辐射的强太赫兹源的实际应用。
