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

作　　者：范群芳[1] 刘晔[1] 曹杰[1] 姚波[1] 毛庆和[1] 

机构地区：[1]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

出　　处：《中国激光》2014年第3期200-204,共5页Chinese Journal of Lasers

基　　金：国家973计划(2013CB934304);国家自然科学基金(61250017;11104282;61377044);中国科学院重点研究项目(KJZD-EW-W02)

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100mW的诱导激光,在0.005mol/L反应液中,经60min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。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 tool/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.

关 键 词：光纤光学 锥形光纤探针 表面增强拉曼散射 银纳米颗粒 激光诱导化学沉积方法 消逝波 

分 类 号：TN248.1[电子电信—物理电子学]