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Plasmon resonance tuning in metal nanostars for surface enhanced Raman scattering

机译:在金属纳米星中进行等离子共振调谐以增强表面拉曼散射

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摘要

We report the fabrication of Au nanostar arrays by means of electron beam lithography, in which the plasmon resonance energy can be tuned via the nanostar size from the visible into the nearinfrared region. The spectral response of the nanostar arrays was investigated by optical extinction (transmittance) experiments, and their surface enhanced Raman scattering performance has been tested at two different excitation wavelengths, 633 nm and 830 nm, using chemisorbed Cresyl violet molecules as analyte. The experimental results are supported by numerical simulations of the spatial and spectral electric field enhancement.
机译:我们报告通过电子束光刻技术制造金纳米星阵列,其中等离子体共振能量可以通过纳米星的大小从可见光到近红外区域进行调节。通过光学消光(透射)实验研究了纳米星阵列的光谱响应,并使用化学吸附的甲酚紫分子作为分析物,在两个不同的激发波长(633 nm和830 nm)上测试了其表面增强的拉曼散射性能。实验结果得到了空间和频谱电场增强的数值模拟的支持。

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