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论文类型： 期刊论文

发表时间： 2016-06-29

发表刊物： JOURNAL OF PHYSICS-CONDENSED MATTER

收录刊物： SCIE、EI、PubMed

卷号： 28

期号： 25

页面范围： 254004

ISSN号： 0953-8984

关键字： lasers; Raman; surface plasmons; surface-enhanced Raman scattering

摘要： In this paper, the physical enhancement mechanisms of the surface-enhanced Raman scattering (SERS) of pyramidal tip substrates are studied theoretically. We structure the periodic square-based arrays of adjacent nanometer pyramidal gold-coated tips on silicon. In order to determine the contribution of plasmonic or diffraction effects on the SERS, three-dimensional (3D) numerical simulations are implemented by taking into account the substrate coated with a gold thin film or a perfect electrical conductor thin film. The tip distance, metal coating thickness and incident light polarization angle are also optimized to investigate whether the further SERS signal can be enhanced.