通过聚焦后的1 kHz飞秒激光直接辐照玻璃衬底上的金属银膜，使得辐照区域形成了织网状的纳米花结构。通过调节入射飞秒激光脉冲的能量、脉冲数目、辐照距离和能量密度等参数来研究纳米花结构的形成条件和机理，结果表明这种银膜表面结构形成的原因可能是由于飞秒激光辐照引起的薄膜烧蚀和随后的熔体凝固等效应共同作用的结果。此外，由于飞秒入射光场与银膜表面的局域等离子波会形成干涉叠加，从而有可能在金属熔体区域造成织网状纳米结构的出现。进一步的实验发现这种制得的银纳米花结构经过若丹明染料分子溶液浸泡后，具有明显的拉曼增强散射效应。

A nanoflower structure is fabricated on the silver film by a focused 1 kHz femtosecond laser irradiation. By controlling the laser irradiation parameters such as pulse energy, number of pulses and out-of-focus distance, a series of silver nanostructures with respective characteristics are produced. According to the optics and scanning electron microscope (SEM) observations, the formation process of silver nanoflower should be due to the combination of femtosecond laser ablation and successively solidified flow dynamics in molten material. Besides, a possible interference modulation between the incident light field and the induced surface plasmon wave also can be responsible for the formation of silver nanoflower. In the application, the irradiated silver film showed strong surface enhanced Raman scattering (SERS) effect after soaked in R6G solution.