title: Investigation of out-of-plane structural properties of a graphene monolayer with gap-plasmons: mode-selective Raman enhancement and the influence of additional sp(3) type defects.
abstract: We report that Raman enhancements of a graphene monolayer sandwiched at the Au nanoparticle-Au thin film junction are different and can be attributed to the influence of a z-polarized incident field. Closer to the center of the junction, radial breathing like-mode (RBLM) shows dramatic Raman enhancement in terms of the coincidence between the z-polarized incident field formed at the junction and the RBLM phonon axis. The appearance of an additional D* peak can be identified and is attributed to the additional out-of-plane sp(3) type defect signal. Correlating I(D*)/I(D) with RBLM intensity variation further substantiates that the observed D* peak is ascribed to another out-of-plane structural defect signal.
authors.affiliation: Material Characterization Team, Materials & Components R&D Lab, LG Electronics Advanced Research Institute, 38, Baumoe-ro, Seocho-gu, Seoul 137-724, South Korea. s952151@gmail.com.
authors.forename: Young Hwan
authors.initials: YH
authors.lastname: Min
authors.forename: Won-Hwa
authors.initials: WH
authors.lastname: Park