title: Numerical study on the mechanisms of the SERS of gold-coated pyramidal tip substrates.
abstract: In this paper, the physical enhancement mechanisms of the surface-enhanced Raman scattering (SERS) of pyramidal tip substrates are studied theoretically. We structure the periodic square-based arrays of adjacent nanometer pyramidal gold-coated tips on silicon. In order to determine the contribution of plasmonic or diffraction effects on the SERS, three-dimensional (3D) numerical simulations are implemented by taking into account the substrate coated with a gold thin film or a perfect electrical conductor thin film. The tip distance, metal coating thickness and incident light polarization angle are also optimized to investigate whether the further SERS signal can be enhanced.
authors.affiliation: School of Physics and Optoelectronic Engineering, Dalian University of Technology, Dalian, 116023, People's Republic of China.
authors.forename: Rui
authors.initials: R
authors.lastname: Li
authors.forename: Qiao
authors.initials: Q
authors.lastname: Wang
authors.forename: Hong
authors.initials: H
authors.lastname: Li
authors.forename: Kun
authors.initials: K
authors.lastname: Liu
authors.forename: Shi
authors.initials: S
authors.lastname: Pan
authors.forename: Weishen
authors.initials: W
authors.lastname: Zhan
authors.forename: Maodu
authors.initials: M
authors.lastname: Chen