▎ 摘　　要

We can experimentally identify the layer-layer breathing mode and the other out-of-plane transverse acoustic phonon modes of a few layered graphene via employing z-polarized incident field formed at Au nanoparticle-Au film junctions. The observed out-of-plane mode phonon at similar to 150 cm(-1) and other transverse acoustic phonon type defect modes from 300 cm(-1) to 700 cm(-1) can be readily explored. Not only for the normally used optical method using focused plane wave but also direct applying the z-directional electromagnetic field on graphene will be expected for more detailed out-of-plane phonon characterization of graphene. (C) 2013 AIP Publishing LLC.