文献类型：期刊文献

英文题名：Light transmission and surface-enhanced raman scattering of quasi-3D plasmonic nanostructure arrays with deep and shallow Fabry-Pérot nanocavities

作者：Xu, Jiajie[1,2]; Guan, Phillip[1]; Kvasnic?ka, Pavel[3]; Gong, Heng[2]; Homola, Jir?í[3]; Yu, Qiuming[1]

机构：[1] Department of Chemical Engineering, University of Washington, Seattle, WA 98195, United States; [2] State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China; [3] Institute of Photonics and Electronics, Academy of Sciences of the Czech Republic, 182 51 Prague, Czech Republic

年份：2011

卷号：115

期号：22

起止页码：10996

外文期刊名：Journal of Physical Chemistry C

收录：EI(收录号：20112414064181)

语种：英文

外文关键词：Surface scattering - Finite difference time domain method - Photoresists - Electric fields - Fabry-Perot interferometers - Surface plasmons - Plasmonics - Gold - Raman scattering - Nanostructures

摘要：Light transmission and surface-enhanced Raman scattering (SERS) of quasi-3D plasmonic nanostructure arrays with deep (820 nm) and shallow (80 nm) Fabry-Pérot (FP) nanocavities were investigated experimentally and by means of 3D-finite-difference time-domain (3D-FDTD) simulations. The arrays with deep FP nanocavites exhibited the extraordinary optical transmission and strong SERS effect, whereas weaker light transmission and 6-time to one-order of magnitude lower SERS enhancement factors were observed for those with shallow FP nanocavities. 3D-FDTD simulations revealed that strong electric fields, arising from localized surface plasmons (LSPs), were confined in the vicinity of the rim of top gold nanoholes and the edge of bottom gold nanodiscs for deep FP nanocavity arrays. In contrast, the LSPs of the top gold nanohole film and the bottom gold nanodiscs were coupled and propagated in the photoresist layer, thereby weakening the electric fields of gold nanostructures. The FP resonances occurred outside the wavelength range of the spectrometer used and therefore were not observed for quasi-3D nanostructures with both deep and shallow nanocavities. ? 2011 American Chemical Society.