Fan Yansong, Zhu Zhihong, Zhang Janfa, Xu Wei, Wu Fan, Yuan Xiaodong, Guo Chucai, Qin Shiqiao
Opt Express. 2022 Nov 7;30(23):41110-41117. doi: 10.1364/OE.474008.
The high saturation current density and ultrafast heating modulation of graphene makes it a competitive candidate for future thermal emission source. However, the low emissivity and easy oxidation under high temperature in air limit graphene application in the spectral range from the visible to near infrared. Here, we report a visible graphene thermal emitter based on the metal Fabry-Pérot (FP) cavity, which can greatly enhance the emissivity of graphene at wavelength around 637 nm and protect graphene from oxidation. We investigate the temperature characteristics of the emitter, and find the temperature of hot electrons in graphene is much higher than that of graphene lattice. Moreover, we also demonstrate the wavelength and intensity of graphene emission could be controlled by tuning the dielectric thickness between two gold layers. These results are helpful in the development of advanced graphene electro-thermal emission controlling application.
石墨烯的高饱和电流密度和超快热调制特性使其成为未来热发射源的有力候选材料。然而，其低发射率以及在空气中高温下易氧化的特性限制了石墨烯在可见光到近红外光谱范围内的应用。在此，我们报道了一种基于金属法布里-珀罗（FP）腔的可见光石墨烯热发射器，它可以在波长约637nm处极大地提高石墨烯的发射率，并保护石墨烯不被氧化。我们研究了该发射器的温度特性，发现石墨烯中热电子的温度远高于石墨烯晶格的温度。此外，我们还证明了通过调整两层金之间的电介质厚度，可以控制石墨烯发射的波长和强度。这些结果有助于先进的石墨烯电热发射控制应用的发展。
