• 文献标题:   Polarized Plasmonic Enhancement by Au Nanostructures Probed through Raman Scattering of Suspended Graphene
  • 文献类型:   Article
  • 作  者:   HEEG S, FERNANDEZGARCIA R, OIKONOMOU A, SCHEDIN F, NARULA R, MAIER SA, VIJAYARAGHAVAN A, REICH S
  • 作者关键词:   raman spectroscopy, enhancement, plasmonic cavity, suspended graphene, strain
  • 出版物名称:   NANO LETTERS
  • ISSN:   1530-6984 EI 1530-6992
  • 通讯作者地址:   Free Univ Berlin
  • 被引频次:   102
  • DOI:   10.1021/nl3041542
  • 出版年:   2013

▎ 摘  要

We characterize plasmonic enhancement in a hotspot between two Au nanodisks using Raman scattering of graphene. Single layer graphene is suspended across the dimer cavity and provides an ideal two-dimensional test material for the local near-field distribution. We detect a Raman enhancement of the order of 10(3) originating from the cavity. Spatially resolved Raman measurements reveal a near-field localization one order of magnitude smaller than the wavelength of the excitation, which can be turned off by rotating the polarization of the excitation. The suspended graphene is under tensile strain. The resulting phonon mode softening allows for a clear identification of the enhanced signal compared to unperturbed graphene.