基于SERS光纤探针近场喇曼光谱检测研究

Study of near-field Raman spectroscopy detection based on SERS fiber probe

为了提高传统喇曼光谱显微技术的光学分辨率,实现待测样品纳米尺度的组分分析,近场光学技术被广泛用于喇曼光谱检测中.基于表面增强喇曼散射(SERS)光纤探针的近场喇曼光谱检测技术,将扫描探针显微技术和喇曼光谱分析技术相结合,通过控制SERS光纤探针对多模光纤端面上样品的扫描,以获得被测样品的近场喇曼成像.利用罗丹明(R6G)试剂对SERS光纤探针的近场喇曼检测性能进行表征,其最低检测浓度达10-7 mol/L,并实验测得了R6G浓度为10-5 mol/L的近场喇曼光谱成像,由此表明SERS光纤探针具有近场喇曼光谱成像能力.

In order to improve the optical resolution of traditional Raman spectroscopic microscopy and achieve nano-scale component analysis of the sample to be measured, near-field optical technology is widely used in Raman spectroscopy detection. Based on the near-field Raman spectroscopy detection technology of surface-enhanced Raman scattering (SERS) fiber probe, scanning probe microscopy and Raman spectroscopy analysis technology are combined to obtain near-field Raman imaging of measured samples by controlling the scanning of multimode fiber end samples by SERS fiber probe. The near-field Raman detection performance of SERS optical fiber probe is characterized by Rhodamine (R6G) reagent. The lowest detection concentration is 10-7 mol/L. The near-field Raman spectroscopic imaging with R6G concentration of 10-5 mol/L is measured experimentally, which indicated that SERS optical fiber probe had near-field Raman spectroscopic imaging ability.