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Proceedings Paper

Simulation of two-dimensional gratings for SERS-active substrate
Author(s): Wenlong Zou; Jianhong Wu
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Paper Abstract

Raman spectroscopy provides intrinsic vibrational and rotational mode of molecules in materials, which is widely used in chemical, medical and environmental domains. As known, the magnitude of surface enhanced Raman scattering can be amplified several orders. Nowadays, common Raman scattering has been gradually replaced by surface enhanced Raman scattering in low concentration detection domain. Generally speaking, the signal of surface enhanced Raman scattering on periodic nanostructures is more reliable and reproducible than on irregular nanostructures. In this paper, two-dimensional gratings coated by noble metal are used as SERS-active substrate. The surface plasmon resonance can be obtained by tuning the period of two-dimensional grating when the excitation laser interacts on the grating. The local electric field distribution is simulated by finite-difference-time-domain (FDTD). The wavelength of 632.8nm and 785nm are usually assembled on commercial Raman spectrometer. The optimization procedure of two-dimensional grating period is simulated by FDTD for above two wavelengths. The relation between the grating period and surface plasmon resonance is obtained in theory. The parameters such as depth of photoresist and thickness of coated metal are systematic discussed. The simulation results will greatly guide our post manufacture, which can be served for the commercial Raman spectrometer in SERS detection.

Paper Details

Date Published: 3 November 2016
PDF: 7 pages
Proc. SPIE 10028, Plasmonics II, 1002819 (3 November 2016); doi: 10.1117/12.2246286
Show Author Affiliations
Wenlong Zou, Soochow Univ. (China)
Jianhong Wu, Soochow Univ. (China)

Published in SPIE Proceedings Vol. 10028:
Plasmonics II
Hongxing Xu; Satoshi Kawata; David J. Bergman; Xing Zhu, Editor(s)

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