石墨烯片中纳米发射体的辐射场
Fields radiated by a nanoemitter in a graphene sheet
摘要：
石墨烯的非凡特性使其成为一种非常有前途的光电子材料。然而，这仍然是一个新生的领域，必须探索石墨烯中电磁场的一些基本性质。在这里，我们报告的纳米发射器躺在石墨烯片辐射的领域。我们的研究结果表明，这个领域提出了一个丰富的依赖于频率，距离源和偶极子的方向。这种行为归因于石墨烯片中电磁态密度的独特性以及它们之间的相互作用。该场主要由高强度电磁场的核心区域和外部区域组成，该核心区域由表面等离子体主导，该外部区域中的场实际上与真空中的发射器相同。在核心区域内，电场的强度比真空中的大几个数量级。重要的是，这个核心区域的大小可以通过外部门来控制，这开辟了许多有趣的应用，例如，表面光学和光谱学。此外，纳米发射器和表面等离子体之间的大耦合使得石墨烯片成为量子光学的有利平台，其中量子物体之间的相互作用可以随意外部定制。
英文摘要：
The extraordinary properties of graphene make it a very promising material for use in optoelectronics. However, this is still a nascent field, where some basic properties of the electromagnetic field in graphene must be explored. Here we report on the fields radiated by a nanoemitter lying on a graphene sheet. Our results show that this field presents a rich dependence on both frequency, distance to the source and dipole orientation. This behavior is attributed to distinct peculiarities on the density of electromagnetic states in the graphene sheet and the interaction between them. The field is mainly composed of an core region of high-intensity electromagnetic field, dominated by surface plasmons, and an outer region where the field is practically the same it would be for an emitter in vacuum. Within the core region, the intensity of the electric field is several orders of magnitude larger than what it would be in vacuum. Importantly, the size of this core region can be controlled thorough external gates, which opens up many interesting applications in, for instance, surface optics and spectroscopy. Additionally, the large coupling between nanoemitters and surface plasmons makes graphene sheets a propitious stage for quantum-optics, in which the interaction between quantum objects could be externally tailored at will.
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