Abstract
We have designed and analyzed a graphene-based photonic crystal
directional coupler working as a switch, which is embedded in a SOI
photonic crystal slab with triangular lattice of dielectric rods. The
directional coupler has two W-1 (one missing row of dielectric rods)
waveguides and the coupling region is coated with a graphene nanoribbon with width W=50 nm.
We use an electric gate to modify the graphene chemical potential to
obtain the desired change of the graphene equivalent permittivity. Thus,
we can drive the directional coupler to get its transition from the bar
state to the cross state and vice-versa. (C) 2014 Elsevier B.V. All
rights reserved.