Open AccessSurface plasmon resonance and field enhancement in #-shaped gold wires metamaterial
Author(s) -
Weiyan Hu,
Erjun Liang,
Pei Ding,
Genwang Cai,
Qianzhong Xue
Publication year - 2009
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.17.021843
Subject(s) - metamaterial , materials science , surface plasmon resonance , optics , plasmon , surface plasmon , raman spectroscopy , surface enhanced raman spectroscopy , surface plasmon polariton , optoelectronics , excitation , polarization (electrochemistry) , localized surface plasmon , raman scattering , wavelength , nanotechnology , physics , chemistry , nanoparticle , quantum mechanics
A #-shaped gold wires metamaterial is designed for surface enhanced Raman spectroscopy (SERS) and sensing. The tunability of surface plasmon resonance (SPR) excitations, hotspots distribution, localized field enhancement and sensitivity of the structure are investigated. In contrast to most metamaterial, the #-shaped structure exhibits two pronounced SPRs that are insensitive to the polarization of excitation light. Pure electromagnetic Raman enhancement factors of about 10(6) are achieved on the symmetrically distributed field hotspots. It is possible to break the usable wavelength range of conventional gold SERS substrates via higher order excitations of the #-shaped metamaterial. In addition, the sensitivity and the figure of merits are found to be comparable or even higher than those of conventional SERS substrates. All these factors together with the high reproducibility nature of metamaterial and its simple planer structure suggest that this structure is very promising for surface enhanced spectroscopy and sensing applications.