Farhat Mohamed, Rockstuhl Carsten, Bağcı Hakan
Division of Computer, Electrical, and Mathematical Sciences and Engineering 4700 King Abdullah University of Science and Technology Thuwal 23955-6900, Saudi Arabia.
Opt Express. 2013 May 20;21(10):12592-603. doi: 10.1364/OE.21.012592.
We demonstrate the possibility of cloaking three-dimensional objects at multi-frequencies in the far-infrared part of the spectrum. The proposed cloaking mechanism exploits graphene layers wrapped around the object to be concealed. Graphene layers are doped via a variable external voltage difference permitting continuous tuning of the cloaking frequencies. Particularly, two configurations are investigated: (i) Only one graphene layer is used to suppress the scattering from a dielectric sphere. (ii) Several of these layers biased at different gate voltages are used to achieve a multi-frequency cloak. These frequencies can be set independently. The proposed cloak's functionality is verified by near- and far-field computations. By considering geometry and material parameters that are realizable by practical experiments, we contribute to the development of graphene based plasmonic applications that may find use in disruptive photonic technologies.
我们展示了在光谱的远红外部分对三维物体进行多频率隐身的可能性。所提出的隐身机制利用包裹在待隐藏物体周围的石墨烯层。通过可变的外部电压差对石墨烯层进行掺杂，从而实现对隐身频率的连续调谐。具体而言，研究了两种配置：（i）仅使用一层石墨烯来抑制来自电介质球体的散射。（ii）使用几个偏置在不同栅极电压下的石墨烯层来实现多频率隐身。这些频率可以独立设置。通过近场和远场计算验证了所提出隐身装置的功能。通过考虑实际实验中可实现的几何和材料参数，我们为基于石墨烯的等离激元应用的发展做出了贡献，这些应用可能会在颠覆性光子技术中得到应用。
