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基于金属纳米结构增强光与物质的相互作用,调控光学响应是光学前沿研究。金属纳米结构能显著增强电磁场和热点空间位置调控,是表面等离激元器件应用的关键。借鉴衍射光学元件设计思想,文中提出一种简单的多尺度叠层圆柱台(double stacked nanocone,DSC)金属纳米结构,实现近/远场深度调控。在给定激发条件下,DSC纳米结构中腔模与局域表面等离激元模式间产生杂化,实现多尺度级联场增强,远场响应也得到有效调制,且“热点”能有效地定位到纳米结构的上表面。进一步,提出并研究了掩模重构的纳米加工方法,低成本、可控地制备了DSC纳米结构,工艺控制是三台阶DSC器件特性的关键,实验结果与理论设计一致。
Based on the metal nanostructure enhancing the interaction between light and matter, the regulation of optical response is an optical frontier research. Metallic nanostructures can significantly enhance the spatial location of electromagnetic fields and hotspots, which is the key to the application of surface plasmon components. Drawing on the design idea of diffractive optical element, a simple double stacked nanocone (DSC) metal nanostructure is proposed in this paper to realize the near-far field depth control. Under a given excitation conditions, hybridization occurs between the cavity mode and the local surface plasmon mode in the DSC nanostructures to enhance the multi-scale cascaded field, and the far-field response is also effectively modulated, and the “hot spot” Effectively locate the top surface of the nanostructures. Further, nanofabrication methods for mask reconstruction are proposed and studied, and the DSC nanostructures are prepared at low cost and controllably. The process control is the key to the characteristics of three-step DSC devices. The experimental results are consistent with the theoretical design.