拉曼散射
激发
材料科学
激光器
拉曼光谱
极化(电化学)
硅
散射
光电子学
分子物理学
光学
分析化学(期刊)
化学
物理化学
物理
量子力学
色谱法
作者
Joseph M. McLellan,† Zhi-Yuan Li,and Andrew R. Siekkinen,Younan Xia
出处
期刊:Nano Letters
[American Chemical Society]
日期:2007-03-22
卷期号:7 (4): 1013-1017
被引量:323
摘要
Silver nanocubes with sharp or truncated corners were synthesized, deposited on silicon substrates, and functionalized with Raman-active thiols for surface-enhanced Raman scattering (SERS) studies. The use of substrates with registration marks allowed us to correlate the SERS spectra from individual nanocubes to their physical parameters revealed by high-resolution SEM imaging. We observed dramatic variations in SERS intensity when the nanocubes were oriented at different angles relative to the polarization of excitation laser. This angular dependence was less significant when the nanocubes were truncated and became nearly spherical in profile. Numerical calculations were employed to confirm our observations, and to attribute the source of variation to the difference in near-field distribution between different laser polarizations.
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