非线性白光生成和单个分子表面增强的拉曼散射之间的空间反对应关系
Manfred J Walter1, Nicholas J Borys, Gerald Gaefke
1Department of Physics, University of Utah, Salt Lake City, Utah 84112, USA.
Journal of the American Chemical Society
|December 5, 2008
概括
我们发现非线性白光发射和单分子表面增强拉曼散射 (SERS) 在银膜上是相关的. 双光子成像可以确定单分子检测的最佳SERS基质.
科学领域:
- 塑制剂的使用方法
- 纳米光子学 纳米光子学
- 频谱学是一种光谱学.
背景情况:
- 表面增强拉曼散射 (SERS) 能够检测单个分子.
- 增强等离子体的非线性光学现象对于先进的光谱学至关重要.
- 碎形银膜为光物质相互作用提供独特的等离子体特性.
研究的目的:
- 研究非线性白光发射与单分子SERS之间的关系.
- 探索使用合聚合物作为SERS的分析剂.
- 评估双光子成像用于预选SERS基质的潜力.
主要方法:
- 使用碎形银膜与合聚合物分析剂.
- 在红外激发下使用非线性白光辐射测量.
- 进行单分子共振SERS分析.
- 应用两个光子成像技术.
主要成果:
- 在没有非线性光辐射的位置观察到单分子SERS.
- 在SERS中广泛的辐射背景可能不是来自光场放大.
- 非线性发射和SERS能力在碎片膜上是空间相关的.
结论:
- 非线性白光发射可以作为SERS活动的指标.
- 双光子成像是一种有前途的方法,用于识别最佳的SERS基质.
- 了解排放背景是推进单分子SERS的关键.
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