“…Surface plasmons provide a channel for the nanoscale manipulation of light and enable a wide range of applications ranging from ultrasensing, − superlensing, , nanolasing, , cloaking , to photothermal cancer therapies. , The significant recent progress in plasmonics has stimulated scientists to develop nanoscale plasmonic analogues of macro- and microscale optical components such as electrooptic devices, , waveguides, − and modulators. , By combining nanoscale optical devices it may be possible to build integrated nanophotonic circuits, offering substantial improvements in bandwidth and speed for next-generation information technologies. , As a central component of this future technology, plasmon waveguiding has been studied extensively, including light-plasmon in/out-coupling, ,, plasmon propagation, , and splitting. , However, the key functional elements of nanophotonic circuits such as plasmon routers, multiplexers, switchers, and logic gates have not yet been realized. Here we show that branched silver nanowire structures can serve as controllable plasmonic routers and multiplexers.…”