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有序贵金属纳米结构由于其本身所特有的光学响应及灵活调控能力,在微纳光电子材料与器件研究领域得到了广泛应用。在众多相关研究中,如何实现金(Au)纳米周期结构的大面积快速制备是人们关心的重要问题之一。采用纳米球自组装刻蚀方法,在大孔周期结构模板内部成功制备了新型二维Au纳米阵列,并有效避免了杂散Au纳米颗粒的产生。通过进一步的工艺优化和参量控制,实现了Au纳米颗粒尺寸的灵活调控,并探讨了其结构形成的物理机理。光学测试研究结果揭示了二维Au纳米阵列的表面等离子体吸收与散射响应,并证明其在近红外飞秒脉冲激励下具有显著的双光子吸收(饱和)效应。该研究结果在太阳能电池,光开关及材料微纳制备等领域具有潜在应用。
The ordered noble metal nanostructures have been widely used in the field of micro / nano optoelectronic materials and devices because of their unique optical response and flexible control ability. Among many related researches, how to realize large-area rapid preparation of gold (Au) nanostructured periodic structure is one of the most important issues of concern. Nanosphere self-assembly etching method was used to successfully fabricate a novel two-dimensional Au nano-array inside the macroporous periodic template and to effectively avoid the generation of spurious Au nanoparticles. Through further process optimization and parameter control, the size of Au nanoparticles can be flexibly controlled and the physical mechanism of the formation of the Au nanoparticles has been discussed. The optical test results reveal the surface plasmon absorption and scattering responses of two-dimensional Au nanocrystals and show that they have significant two-photon absorption (saturation) effects under near-infrared femtosecond pulse excitation. The results of this study have potential applications in the fields of solar cells, optical switches and micro / nano material preparation.