利用激光诱导化学沉积法制备锥形光纤SERS探针

范群芳; 刘晔; 曹杰; 姚波; 毛庆和

doi:doi:10.3788/cjl201441.0310001

中国激光, 2014, 41 (3): 0310001, 网络出版: 2014-03-03

利用激光诱导化学沉积法制备锥形光纤SERS探针

Fabrications for Tapered Fiber SERS Probes with Laser-Induced Chemical Deposition Method

论文大纲

范群芳 ^*刘晔曹杰姚波毛庆和

作者单位

中国科学院安徽光学精密机械研究所安徽省光子器件与材料重点实验室, 安徽合肥 230031

摘要

实验研究了激光诱导化学沉积法(LICDM)制备锥形光纤表面增强拉曼散射(SERS)探针及其SERS检测性能。结果表明，因不同角度光纤探针锥面出射光场分布不同，导致了LICDM在制备小锥角光纤探针时沉积纳米颗粒的困难，但是通过延长反应时间，利用银纳米颗粒的光散射效应可改善小角度光纤探针表面纳米颗粒的制备效果。实验利用100 mW的诱导激光，在0.005 mol/L反应液中，经60 min沉积，制备出了不同锥角的光纤探针。对光纤探针的测试结果表明，锥角为8.2°的光纤探针所测得的SERS频移峰及其荧光背景的幅度最大，且该角度在不同SERS激发光功率下基本不变。

Abstract

The fabrications for the tapered fiber probes with the laser-induced chemical deposition method (LICDM) and the surface enhanced Raman scattering (SERS) detection performance of the prepared probes are experimentally investigated in this paper. Our results show that, it is difficult to deposit nanoparticles on the surface of the small cone angle tapered fiber probes with LICDM. The main reason is that the taper surfaces are mainly covered by a relatively low-intensity evanescent field. By lengthening the reaction time, however, it is still possible to deposit nanoparticles on small-angle tapers with the light-scattering effect, which is caused by the silver nanoparticles. With the inducing laser power of 100 mW and the reaction solution of 0.005 mol/L, tapered fiber probes with different cone angles are successfully prepared after depositing for 60 min. The testing results show that for this specific preparation condition, the tapered fiber probe with the cone angle of 8.2° exhibits the highest SERS spectral intensity, which is almost unchanged for different excitation laser powers.

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范群芳, 刘晔, 曹杰, 姚波, 毛庆和. 利用激光诱导化学沉积法制备锥形光纤SERS探针[J]. 中国激光, 2014, 41(3): 0310001. Fan Qunfang, Liu Ye, Cao Jie, Yao Bo, Mao Qinghe. Fabrications for Tapered Fiber SERS Probes with Laser-Induced Chemical Deposition Method[J]. Chinese Journal of Lasers, 2014, 41(3): 0310001.

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