Nano-gap between a gold tip and nanorod for polarization dependent surface enhanced Raman scattering

We demonstrate experimentally that a nano-gap could be constructed by using ascanning probe microscope to allow agold tip to approach agoldnanorod immobilized on a glass coverslip. The nano-gap can enhance Raman scattering ofgraphene sandwiched between the tip and thenanorod. The Raman intensity was strongly dependent on the incident lightpolarization. Here, linear, radial, azimuthal, and intermediate states between radial and azimuthalpolarization were investigated and compared in detail. The maximumsurface-enhanced Raman scattering effect of the nano-gap occurred for the intermediate states between the radial and azimuthal polarized light.

Source: Applied Physics Letters - December 6, 2016 Category: Physics Authors: Zhengmin Cao, Yingbo He, Yuqing Cheng, Jingyi Zhao, Guantao Li, Qihuang Gong and Guowei Lu Source Type: research