LAUSR

Abstract In this paper, a surface-enhanced fluorescent (SEF) substrate with Ag nanostructures was synthesized by magnetron sputtering, which exhibits simple, fast, inexpensive, environmentally friendly properties, and can also be in a bulk production. The localized surface plasmon resonance (LSPR) generated by Ag-decorated dragonfly wings (DWs) substrate plays a huge role in fluorescence enhancement. The common rhodamine 6G (R6G) was used as the fluorescent dye, and a substrate having high fluorescence intensity was selected. Besides, the morphological and optical properties of the different substrates were characterized, and their enhancement factor (EF) were also calculated in order to more accurately quantify the enhancement of fluorescence. Meanwhile, using finite-difference time-domain (FDTD) method to simulate the local surface electromagnetic field of Ag nanostructure is helpful to further analyze the “hot spots” distribution of the substrate. Experimental results show that the substrate has excellent stability, reproducibility and reusability, which will have great application prospects in many fields such as life science, environmental testing, optoelectronic devices.