El-Sayed Marwa A, Ermolaev Georgy A, Voronin Kirill V, Romanov Roman I, Tselikov Gleb I, Yakubovsky Dmitry I, Doroshina Natalia V, Nemtsov Anton B, Solovey Valentin R, Voronov Artem A, Novikov Sergey M, Vyshnevyy Andrey A, Markeev Andrey M, Arsenin Aleksey V, Volkov Valentyn S
Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane, 141700 Dolgoprudny, Russia.
Department of Physics, Faculty of Science, Menoufia University, Shebin El-Koom 32511, Egypt.
Nanomaterials (Basel). 2021 May 7;11(5):1230. doi: 10.3390/nano11051230.
Graphene is a promising building block material for developing novel photonic and optoelectronic devices. Here, we report a comprehensive experimental study of chemical-vapor deposited (CVD) monolayer graphene's optical properties on three different substrates for ultraviolet, visible, and near-infrared spectral ranges (from 240 to 1000 nm). Importantly, our ellipsometric measurements are free from the assumptions of additional nanometer-thick layers of water or other media. This issue is critical for practical applications since otherwise, these additional layers must be included in the design models of various graphene photonic, plasmonic, and optoelectronic devices. We observe a slight difference (not exceeding 5%) in the optical constants of graphene on different substrates. Further, the optical constants reported here are very close to those of graphite, which hints on their applicability to multilayer graphene structures. This work provides reliable data on monolayer graphene's optical properties, which should be useful for modeling and designing photonic devices with graphene.
石墨烯是用于开发新型光子和光电器件的一种很有前景的基础材料。在此，我们报告了一项关于化学气相沉积（CVD）单层石墨烯在三种不同衬底上的光学性质的综合实验研究，该研究覆盖紫外、可见和近红外光谱范围（240至1000纳米）。重要的是，我们的椭偏测量不受额外纳米厚水层或其他介质假设的影响。这个问题对于实际应用至关重要，因为否则这些额外的层必须包含在各种石墨烯光子、等离子体和光电器件的设计模型中。我们观察到不同衬底上石墨烯的光学常数存在细微差异（不超过5%）。此外，这里报告的光学常数与石墨的光学常数非常接近，这暗示了它们在多层石墨烯结构中的适用性。这项工作提供了关于单层石墨烯光学性质的可靠数据，这对于用石墨烯建模和设计光子器件应该是有用的。
