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受纳米结构损伤限制的光纤拉曼探头SERS探测灵敏度

, PP. 348-353

Keywords: 光谱学,表面增强拉曼散射,光纤拉曼探头,损伤,局域表面等离子振荡

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Abstract:

利用光线追迹法,研究了典型光纤拉曼探头在纳米结构损伤限制下收集到的SERS功率与样品位置之间关系,结果表明,对于不同焦距构成的同轴等光程光纤拉曼探头,在给定的纳米结构损伤阈值激发光功率密度下,样品偏离焦平面反而会使探头收集到的SERS功率增加,相比于样品远离探头方向偏离焦平面,靠近探头方向偏离焦平面时收集到的SERS功率更高。此外,收集光纤芯径越大,探头所收集的SERS功率越大。

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