title: Localized surface plasmons, surface plasmon polaritons, and their coupling in 2D metallic array for SERS.
abstract: A substrate with ease for fabrication is proposed for surface enhanced Raman spectroscopy (SERS). A two-dimensional dielectric grating covered by a thin silver film enables the excitation of both localized surface plasmons (LSPs) and surface plasmon polaritons (SPPs). The finite-difference time-domain simulation results show that the coupling between LSPs and SPPs is able to highly improve the Raman enhancement (2 x 10(9) as obtained by simulation). In addition, the near-field distribution at the top of cubic bumps along the transverse plane presents a highly regular hotspots pattern, which is required for an ideal SERS substrate.
authors.affiliation: Institute of Optoelectronic Materials and Technology, South China Normal University, Guangzhou 510631, China.
authors.forename: Luping
authors.initials: L
authors.lastname: Du
authors.forename: Xuejin
authors.initials: X
authors.lastname: Zhang
authors.forename: Ting
authors.initials: T
authors.lastname: Mei
authors.forename: Xiaocong
authors.initials: X
authors.lastname: Yuan