量子电子学报, 2013, 30 (3): 348, 网络出版: 2013-08-05
受纳米结构损伤限制的光纤拉曼探头SERS探测灵敏度
SERS detection sensitivity of fiber Raman probe limited by nanostructure damage threshold
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 spectroscopy surface-enhanced Raman scattering fiber Raman probe damage localized surface plasmon resonance
摘要
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表面增强拉曼散射(SERS)功率与样品位置之间的关系。 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。
Abstract
The relationship between surface-enhanced Raman scattering (SERS) power collected by the fiber Raman probe and sample position was investigated theoretically under the sample damage threshold limit by using ray tracing method. The results show that, in a given damage excitation power density threshold, the SERS power collected by the probe with different focal-length lens increases when the sample deviates from the focal plane. Furthermore, compared with the situation that the sample is away from the probe and deviate from the focal plane, SERS power collected by the probe is higher at the situation that the sample is close to the probe and deviates from the focal plane. In addition, the lager the collection fiber core diameter is, the greater the power collected by the probe will be.
廖艳林, 张腊梅, 刘晔, 曹杰, 毛庆和. 受纳米结构损伤限制的光纤拉曼探头SERS探测灵敏度[J]. 量子电子学报, 2013, 30(3): 348. LIAO Yan-lin, ZHANG La-mei, LIU Ye, CAO Jie, MAO Qing-he. SERS detection sensitivity of fiber Raman probe limited by nanostructure damage threshold[J]. Chinese Journal of Quantum Electronics, 2013, 30(3): 348.