Journal Highlight: M-shaped grating by nanoimprinting: A replicable, large-area, highly active plasmonic surface-enhanced Raman scattering substrate with nanogaps

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  • Published: May 5, 2014
  • Author: spectroscopyNOW
  • Channels: Raman
thumbnail image: Journal Highlight: M-shaped grating by nanoimprinting: A replicable, large-area, highly active plasmonic surface-enhanced Raman scattering substrate with nanogaps
A simple M-shaped nanograting with narrow V-shaped grooves has been fabricated as a SERS substrate to enhance light-matter interactions.

M-shaped grating by nanoimprinting: A replicable, large-area, highly active plasmonic surface-enhanced Raman scattering substrate with nanogaps

Small, 2014, 10, 1603-1611
Zhendong Zhu, Benfeng Bai, Huigao Duan, Haosu Zhang, Mingqian Zhang, Oubo You, Qunqing Li, Qiaofeng Tan, Jia Wang, Shoushan Fan Guofan Jin

Abstract: Plasmonic nanostructures separated by nanogaps enable strong electromagnetic-field confinement on the nanoscale for enhancing light-matter interactions, which are in great demand in many applications such as surface-enhanced Raman scattering (SERS). A simple M-shaped nanograting with narrow V-shaped grooves is proposed. Both theoretical and experimental studies reveal that the electromagnetic field on the surface of the M grating can be pronouncedly enhanced over that of a grating without such grooves, due to field localization in the nanogaps formed by the narrow V grooves. A technique based on room-temperature nanoimprinting lithography and anisotropic reactive-ion etching is developed to fabricate this device, which is cost-effective, reliable, and suitable for fabricating large-area nanostructures. As a demonstration of the potential application of this device, the M grating is used as a SERS substrate for probing Rhodamine 6G molecules. Experimentally, an average SERS enhancement factor as high as 5×108 has been achieved, which verifies the greatly enhanced light–matter interaction on the surface of the M grating over that of traditional SERS surfaces.

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