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中文摘要：
利用激光诱导沉积的方法直接在光纤端面沉积了银纳米膜，并用SERS光谱监测了这一沉积过程，在光纤端面上生成的银膜出现了“年轮”状宏观形貌，这种形貌与激光在光纤中的干涉与衍射条纹分布相一致，证明了这种现象是由激光诱导反应引发的，结合实验结果进一步讨论了银纳米膜的形成机理．在光纤上沉积的银纳米膜作为光纤SERS传感器的基底与其它制备基底的方法比较也具有实验操作简便，耗时短，重现性好，SERS增强效果强等诸多优点，是一种非常好的制备光纤SERS传感器基底的方法．
英文摘要：
A novel method of modifying the probe of SERS-optical sensor is described. By using laser-induced deposition and growth of Ag nanoparticles, we prepared a new type of Ag-deposited film with the appearance of annum tings on the fiber tip. A 6 cm-long silica fiber is immersed in the mixture of AgNO3 and citrate. A 514. 5 nm laser with the power of 4. 2 mW is used to reduce the Ag（ Ⅰ ） to Ag（0） and induced Ag（0） to deposit onto the fiber tip. SERS spectra of a probe molecule （BPENB） are used to monitor the deposition process. The optical and AFM images display the macro- and micro-appearance of Ag-deposited film. These results show that the laser-induced deposition is a simple and rapid method for modifying the probe of SERS optical sensor. The Ag film with the proper thickness and roughness is prepared within only about 4. 5 rain. Moreover, the Ag deposition film prepared by this method shows not only easy reproduction but also remarkable SERS activity. The mechanism of the laser-induced Ag deposition onto the fiber tip was also discussed.
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