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Published on: April 28, 2022
Disparity-amplified chiral SERS using a PSP-LSP-coupled substrate
Chiyi Wei1, Yanlong Li1, Haijiao Xu2
1School of Physics and Optoelectronics, State Key Laboratory of Luminescent Materials and Devices, Guangdong Engineering Technology Research and Development Centre of Special Optical Fibre Materials and Devices, Guangdong Provincial Key Laboratory of Fibre Laser Materials and Applied Techniques, South China University of Technology, Guangzhou 510640, China. phlzh@scut.edu.cn.
Abstract:
Chiral recognition plays a vital role in chemical, biological, and pharmaceutical studies. However, differentiating enantiomers is still challenging. This study presents a new approach to enhance the distinction between enantiomers in surface-enhanced Raman scattering (SERS) by leveraging the coupling effect of propagating surface plasmons (PSPs) and localized surface plasmons (LSPs). We constructed a SERS substrate that integrates laser-induced periodic surface structures with chiral plasmonic nanoparticle 432 helicoid III, creating a PSP-LSP coupling mechanism. The results demonstrate that the composite substrate not only enhances the SERS signal but also effectively amplifies the disparity between enantiomers. This advancement paves a new pathway in chiral SERS substrate design and the research of enantiomeric disparity amplification.
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