Release Time:2019-03-13  Hits:

Indexed by: Journal Article

Date of Publication: 2016-06-29

Journal: JOURNAL OF PHYSICS-CONDENSED MATTER

Included Journals: PubMed、EI、SCIE

Volume: 28

Issue: 25

Page Number: 254004

ISSN: 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.