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7 August 2015 Periodic nanostructures for SERS-active substrate
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Raman spectroscopy has become a very important tool in many fields, including chemistry, material, environmental protecting and etc. While Raman scattering is a weak process, it is often hampered in background noise. Since surface enhanced Raman scattering (SERS) was observed for the first time in 1974, surface enhanced Raman spectroscopy has developed more and more rapidly. Periodic nanostructures have the advantage of reliable and reproducible Raman signal relative to the irregular nanostructures. In this paper, holographic gratings coated by metal are proposed to fabricate SERS-active substrate. The excitation light excite on the gratings with proper grating constant that will lead to plasmon resonant phenomena, which enhance local electric field for Raman scattering. The electric field enhancement of sinusoidal, rectangular and triangular gratings is simulated using a commercially available software finite-difference-time-domain (FDTD). Period, groove depth, duty cycle and coated metal thickness of gratings affecting the electric field enhancement are also discussed. The optimum grating structure for SERS-active substrate is obtained in theory.
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Wenlong Zou, Zhijian Cai, and Jianhong Wu "Periodic nanostructures for SERS-active substrate", Proc. SPIE 9623, 2015 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 96230W (7 August 2015);

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