Simulation of two-dimensional gratings for SERS-active substrate

Wenlong Zou; Jianhong Wu

doi:10.1117/12.2246286

3 November 2016 Simulation of two-dimensional gratings for SERS-active substrate

Wenlong Zou, Jianhong Wu

Proceedings Volume 10028, Plasmonics II; 1002819 (2016) https://doi.org/10.1117/12.2246286
Event: SPIE/COS Photonics Asia, 2016, Beijing, China

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.

Citation Download Citation

Wenlong Zou and Jianhong Wu "Simulation of two-dimensional gratings for SERS-active substrate", Proc. SPIE 10028, Plasmonics II, 1002819 (3 November 2016); https://doi.org/10.1117/12.2246286

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KEYWORDS

Metals

Photoresist materials

Surface plasmons

Surface enhanced Raman spectroscopy

Raman scattering

Raman spectroscopy

Finite-difference time-domain method

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