Title of Paper:Numerical study on the mechanisms of the SERS of gold-coated pyramidal tip substrates

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Date of Publication:2016-06-29

Journal:JOURNAL OF PHYSICS-CONDENSED MATTER

Included Journals:SCIE、EI、PubMed

Volume:28

Issue:25

Page Number:254004

ISSN No.:0953-8984

Key Words:lasers; Raman; surface plasmons; surface-enhanced Raman scattering

Abstract: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.