Wafer-scale fabrication of high-density nanoslit arrays for surface-enhanced Raman spectroscopy.
Surfaces with a periodic nanostructure and controllable feature size are sought after for optical applications, and the fabrication of such surfaces in large areas with high reproducibility, good stability and low deviation is very important. We present a strategy to fabricate large-area nanoslit arrays with controllable pitches and gaps. Au nanoslit arrays with gaps down to around 10 nm and a high gap density of 2.0 × 104cm-1have been fabricated, which can greatly enhance the near-field electromagnetic field to achieve localized surface plasmon resonance (LSPR). An averaged surface-enhanced Raman scattering analytical enhancement factor of 8.0 × 107has been achieved on the substrate using a 633 nm laser source and the 'coupling effect' of LSPR of the nanoslits.
Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, People's Republic of China. Joint International Research Laboratory of Optical Information of the Chinese Ministry of Education, South China Normal University, Guangzhou 510006, People's Republic of China.
Mingliang
M
Jin
Yunfei
Y
Zhu
Albert
A
van den Berg
Zhang
Z
Zhang
Guofu
G
Zhou
Lingling
L
Shui