Highly tunable hybrid metamaterials employing split-ring resonators strongly coupled to graphene surface plasmons.
Highly tunable hybrid metamaterials employing split-ring resonators strongly coupled to graphene surface plasmons.
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DOI：
10.1038/ncomms9969
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发表时间：
2015-11-20
影响因子：
16.6
通讯作者：
Nash GR
中科院分区：
文献类型：
--
作者：
Liu PQ;Luxmoore IJ;Mikhailov SA;Savostianova NA;Valmorra F;Faist J;Nash GR
超材料和等离子体是非常规操纵和利用光的强大工具。超材料可以被设计成具有天然材料所缺乏的有趣特性，例如负折射率。等离子体提供了将光限制在亚波长维度和增强光-物质相互作用的能力。最近，石墨烯基等离子体的技术潜力已被公认为后者具有大的可调谐性，更高的场约束和更低的损失相比，基于金属的等离子体。在这里，我们介绍了混合结构，包括石墨烯等离子体谐振器耦合到传统的开口环谐振器，从而展示了一种高度可调的超材料，其中两个谐振之间的相互作用达到强耦合制度。这种混合超材料被用作高速THz调制器，表现出超过60%的透射调制和超过40 MHz的工作速度。该器件概念还提供了一个平台，用于探索石墨烯等离子体结构中的腔增强光-物质相互作用和光学过程，用于包括传感，光电检测和非线性频率产生在内的应用。 实现宽光谱范围的可调谐超材料具有极大的兴趣。在此，Liu等人介绍了包括石墨烯等离子体谐振器的混合结构，石墨烯等离子体谐振器强耦合到传统的开口环谐振器，并且以高于40 MHz的操作速度达到60%的传输调制。
Metamaterials and plasmonics are powerful tools for unconventional manipulation and harnessing of light. Metamaterials can be engineered to possess intriguing properties lacking in natural materials, such as negative refractive index. Plasmonics offers capabilities of confining light in subwavelength dimensions and enhancing light–matter interactions. Recently, the technological potential of graphene-based plasmonics has been recognized as the latter features large tunability, higher field-confinement and lower loss compared with metal-based plasmonics. Here, we introduce hybrid structures comprising graphene plasmonic resonators coupled to conventional split-ring resonators, thus demonstrating a type of highly tunable metamaterial, where the interaction between the two resonances reaches the strong-coupling regime. Such hybrid metamaterials are employed as high-speed THz modulators, exhibiting ∼60% transmission modulation and operating speed in excess of 40 MHz. This device concept also provides a platform for exploring cavity-enhanced light–matter interactions and optical processes in graphene plasmonic structures for applications including sensing, photo-detection and nonlinear frequency generation. Realizing tunable metamaterials across a broad spectral range is of great interest. Here, Liu et al. introduce hybrid structures comprising graphene plasmonic resonators strongly coupled to conventional split-ring resonators and reach 60% transmission modulation with an operating speed above 40 MHz.