Plasmonic Rainbow Trapping by a Silica–Graphene–Silica on a Sloping Silicon Substrate

We give a proposal for plasmonic rainbow trapping based on a novel structure comprised of a silica-graphene-silica on a sloping silicon substrate, which, importantly, overcomes the intrinsic constraints that are required by metal/dielectric interface. As compared with previous plasmonic grating structures for rainbow trapping, the adiabatic control of the dispersion curve for the present one is achieved by gradually changing the equivalent …