TL;DR: On this paper, the authors described the plant-mediated synthesis of silver nanoparticles using the plant leaf extract of Coleus aromaticus, which functions for a decreasing and capping agent. According to the special Qualities of optical Fano resonance and plasmonic-waveguide coupling methods, this paper explores a novel refractive index focus https://www.directivepublications.org/journal-of-applied-nanoscience/