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20 September 2011 Plasmonic logic gates and devices in silver nanowire networks
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The local electric field distribution of propagating surface plasmons along Ag nanowires can be imaged by coating the nanowires with a layer of quantum dots, which provide a useful tool to study the plasmon propagation. In simple photonic networks composed of Ag nanowires, plasmons can be controllably routed to a specific nanowire output. The underlying physical mechanism is that the plasmon interferences modulate the near field distribution and thus control the output intensity. The plasmon interference can result in combinations of optical signals that execute specific interferometric Boolean logic operations. And a complete family of Boolean logic gates is realized in the simple nanowire networks. The primary nanowire in the network can be viewed as the plasmonic equivalent of a bus in a central processing unit. Furthermore, a plasmonic NOR gate is demonstrated by cascading OR gate and NOT gate. To realize the cascaded NOR gate, the plasmon wave packet should overlap with the junction between the main wire and the branch wire for the control signal.
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Hong Wei and Hongxing Xu "Plasmonic logic gates and devices in silver nanowire networks", Proc. SPIE 8096, Plasmonics: Metallic Nanostructures and Their Optical Properties IX, 80961W (20 September 2011);

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