Plasmonically Nanoconfined Light Probing Invisible Phonon Modes in Defect-Free Graphene

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• 作者：Katsuyoshi Ikeda ; Mai Takase ; Norihiko Hayazawa ; Satoshi Kawata ; Kei Murakoshi ; Kohei Uosaki
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：August 7, 2013
• 年：2013
• 卷：135
• 期：31
• 页码：11489-11492
• 全文大小：303K
• 年卷期：v.135,no.31(August 7, 2013)
• ISSN：1520-5126

文摘

We present a simple plasmonic method that enables tuning of accessibility to the dipole-forbidden transition states of matter. This technique is realized by well-controlled plasmonic dimers, which can confine optical fields on the order of molecular dimensions. As an example, the approach is applied to activate invisible noncenter phonon modes of defect-free graphene in resonance Raman spectra. The relative intensity of the normally forbidden modes with respect to the dipole allowed modes progressively increases as the degree of field confinement increases. This opens up a novel avenue for both photochemical excitation of molecular systems and nanoscale characterization of materials.