Enhanced light-matter interactions in graphene-covered gold nanovoid arrays.
Enhanced light-matter interactions in graphene-covered gold nanovoid arrays.
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DOI：
10.1021/nl402120t
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发表时间：
2013-06
期刊：
影响因子：
10.8
通讯作者：
Xiaolong Zhu;Lei Shi;M. Schmidt;A. Boisen;O. Hansen;J. Zi;S. Xiao;N. Mortensen
中科院分区：
文献类型：
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作者：
Xiaolong Zhu;Lei Shi;M. Schmidt;A. Boisen;O. Hansen;J. Zi;S. Xiao;N. Mortensen
目前正在探索石墨烯与贵金属纳米结构的结合，以通过等离子体增强强光-石墨烯相互作用。我们介绍了一种新的石墨烯-金属混合系统，用于研究光-物质相互作用与金-空洞纳米结构在可见光范围内的共振。石墨烯与纳米空洞阵列的等离子体模式的增强耦合导致底层等离子体共振的显著频移，通过添加单层石墨烯使绝对光吸收增强30%，并使石墨烯的拉曼响应增强高达700倍。这些新的视角使我们能够验证石墨烯在金空隙阵列上的存在，并且这种增强甚至使我们能够准确地量化层数。数值模拟和微扰理论分析进一步支持了实验观测结果。石墨烯金空平台有利于分子传感和将罗丹明6G （R6G）染料分子放置在石墨烯上；我们观察到R6G拉曼指纹有很强的增强。这些结果为表面增强拉曼散射（SERS）的先进衬底铺平了道路，有可能在原子定义良好的石墨烯层上进行明确的单分子检测。
The combination of graphene with noble-metal nanostructures is currently being explored for strong light-graphene interactions enhanced by plasmons. We introduce a novel hybrid graphene-metal system for studying light-matter interactions with gold-void nanostructures exhibiting resonances in the visible range. Enhanced coupling of graphene to the plasmon modes of the nanovoid arrays results in significant frequency shifts of the underlying plasmon resonances, enabling 30% enhanced absolute light absorption by adding a monolayer graphene and up to 700-fold enhancement of the Raman response of the graphene. These new perspectives enable us to verify the presence of graphene on gold-void arrays, and the enhancement even allows us to accurately quantify the number of layers. Experimental observations are further supported by numerical simulations and perturbation-theory analysis. The graphene gold-void platform is beneficial for sensing of molecules and placing Rhodamine 6G (R6G) dye molecules on top of the graphene; we observe a strong enhancement of the R6G Raman fingerprints. These results pave the way toward advanced substrates for surface-enhanced Raman scattering (SERS) with potential for unambiguous single-molecule detection on the atomically well-defined layer of graphene.