Open AccessLocalized surface plasmons, surface plasmon polaritons, and their coupling in 2D metallic array for SERS
Author(s) -
Luping Du,
Xuejin Zhang,
Ting Mei,
Xiaocong Yuan
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.001959
Subject(s) - surface plasmon polariton , surface plasmon , materials science , plasmon , optics , nanophotonics , localized surface plasmon , surface enhanced raman spectroscopy , grating , raman spectroscopy , polariton , optoelectronics , substrate (aquarium) , raman scattering , physics , oceanography , geology
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.