Femtosecond laser fabrication of silver plasmonic structures for application as single particle SERS detectors

This work demonstrates the feasibility of fabricating silver nanoparticles (NPs) into sub-micron and micron-sized core-satellite structures by exposure to femtosecond laser radiation. We find that the size and shape of these structures can be tailored by adjusting laser fluence (1.8–10.5 J cm−2) and irradiation time (20–60 min), along with the concentration of NPs in aqueous solution (0.01–0.05 mM). Raman measurements of adenine molecules …