**6. Conclusion**

In this chapter, we have briefly introduced some important applications with localized and propagated surface plasmons in gold nanospheres/nanorods and silver nanowires. Specifically, we have described some novel results on gold nanorods enhanced light emission, surface plasmon propagation in silver nanowires, gold nanosphere as a plasmonic nano-cavity, energy conversion in silver-polymer nanostructures. Due to the limited space, many important progress in quantum plasmonics, nonlinear plasmonics, and photovoltaic plasmonics cannot be described altogether. The work in this chapter presents the applications of gold/silver nanoparticles/nanowires in nanophotonics to realize light generation, propagation, manipulation and conversion. It is an ultimate dream for plasmonics to combine photonics and electronics on practical devices and circuits. This huge challenge continued to motivate the research interests all around the world.
