Deep subwavelength plasmonic waveguide switch in double graphene layer structure

Graphene provides excellent prospects of the dynamic tunability, low propagation loss, and extreme mode confinement for plasmonic excitations in the infra-red and terahertz frequencies. We show that in a deep subwavelength double graphene layer structure, graphene plasmons can be routed between two different graphene waveguides by relatively small chemical potential tuning. We develop a coupled mode theory that completely accounts for the switching behavior observed in numerical simulations. Such a deep subwavelength 1 x 2 device is a crucial enabling component towards large-scale integrated deep-subwavelength electromagnetic circuits. (C) 2013 AIP Publishing LLC.