摘要
基于光纤渐逝波原理,结合表面增强拉曼散射(surface-enhanced Raman scattering,SERS)技术,实验研究一种银溶胶涂覆的2×2熔锥光纤的SERS特性.熔锥光纤由一对单模光纤经过熔融拉制而成,固化在其表面的银溶胶为表面活性基底,起拉曼增强作用.随着锥区长度的增加,纤芯逐渐减小,其对光的束缚能力变弱,从而透射出较强的可作为拉曼激发光源的渐逝波.实验中,以R6G为待测溶液,在耦合锥区探测到低浓度目标分子R6G的拉曼光谱,其最低检测浓度达到了10-8 mol/L。
Based on the optical fiber evanescent-wave excitation and surface-enhanced Raman scattering（SERS）,we have carried out experimental studies on SERS characteristics of the 2×2 fused fiber coupler coated with Ag colloid particles.By stretching a pair of fused single-mode fibers with coating Ag colloid on its surface,the formed component can work as the surface-active substrate to perform Raman enhancement.With increase of the taper length,fiber core diameters decrease and less energy are bounded in the fiber.This enables stronger evanescent-wave to leak outward and become a Raman exciting source.In the experiments,the Raman spectra of R6G solutions has been detected at the coupling zone.The minimum detected concentration is 10-8 mol/L.
出处
《上海大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第1期7-11,共5页
Journal of Shanghai University:Natural Science Edition
基金
国家自然科学基金资助项目(61027015
61107076)
上海市科委重点实验室资助项目(10DZ2210900)
上海市重点学科建设资助项目(S30108)
上海大学研究生创新基金资助项目(SHUCX112146)
关键词
表面增强拉曼散射
2×2熔锥光纤
渐逝波
表面活性基底
R6G
surface-enhanced Raman scattering（SERS）
2×2 fused fiber
evanescent-wave
surface active-substrate
R6G
