This research was funded by the US Department of Energy Basic Science Office under Contract No. DE-FG02-10ER46406.
Applied Physics Letters
Plasmons (Physics), Nanostructures
Electron emission microscopy is used to visualize plasmonic routing in gold nano-structures. We show that in single-crystalline gold structures reliable routing can be achieved with polarization switching. The routing is due to the polarization dependence of the photon-to-plasmon coupling, which controls the mode distribution in the plasmonic gold film. We use specifically designed, single-crystalline planar structures. In these structures, the plasmon propagation length is sufficiently large such that significant plasmon power can be delivered to the near-field region around the end tips of the router. Solid state devices based on internal electron excitation and emission processes appear feasible.
Könenkamp, R. R., Word, R. C., Fitzgerald, J. J., Nadarajah, A., & Saliba, S. S. (2012). Controlled spatial switching and routing of surface plasmons in designed single-crystalline gold nanostructures. Applied Physics Letters, 101(14), 141114.