Silver nanoisland enhanced Raman interaction in graphene
Silver nanoisland enhanced Raman interaction in graphene
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DOI：
10.1063/1.4758696
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发表时间：
2012-10
影响因子：
4
通讯作者：
A. Urich;A. Pospischil;M. Furchi;D. Dietze;K. Unterrainer;T. Mueller
中科院分区：
文献类型：
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作者：
A. Urich;A. Pospischil;M. Furchi;D. Dietze;K. Unterrainer;T. Mueller
石墨烯在光电应用方面显示出巨大的潜力，但由于其单原子厚度，与光的相互作用相当弱。在这里，我们报告的增强相互作用的石墨烯和光的拉曼跃迁使用局部表面等离子体。等离子体激元是在银纳米岛中产生的，我们通过在石墨烯顶部沉积金属的简单方法制造。尽管纳米岛的尺寸分布很广，但我们发现拉曼信号增强了100倍。我们提供了一个分析模型的光学性质的描述，并获得散射截面以及增强因子的拉曼跃迁。此外，我们调查，无论是光学和电学，所引入的纳米岛的掺杂。
Graphene shows great potential for optoelectronic applications but suffers from rather weak interaction with light due its single-atomic thickness. Here, we report the enhanced interaction of graphene and light for Raman transitions using localized surface plasmons. The plasmons are generated in silver nanoislands that we fabricate by simple means of metal deposition on top of graphene. Despite the broad size distribution of the nanoislands, we find a 100-fold enhancement of the Raman signal. We provide an analytical model for the description of the optical properties and obtain the scattering cross section as well as enhancement factors for the Raman transitions. In addition, we investigate, both optically and electrically, the doping that is introduced by the nanoislands.