title: Toward integrated electrically controllable directional coupling based on dielectric loaded graphene plasmonic waveguide.
abstract: We propose and numerically analyze a mid-infrared electrically controllable plasmonic waveguide directional coupler that is composed of two parallel identical straight dielectric loaded graphene plasmonic waveguide and S-shaped waveguide bends. By varying the Fermi energy level of the graphene sheet, the maximum power coupled from the input waveguide to the cross-waveguide and the corresponding coupling length could be effectively tuned. Under different Fermi energy level, this directional coupler could serve as an electrically controlled optical switch or a 3-dB splitter around the wavelength of 10.5 μm. Moreover, the size of the entire device is really in sub-wavelength scale making it very facilitative for high density integration.
authors.forename: W
authors.initials: W
authors.lastname: Xu
authors.forename: Z H
authors.initials: ZH
authors.lastname: Zhu
authors.forename: K
authors.initials: K
authors.lastname: Liu
authors.forename: J F
authors.initials: JF
authors.lastname: Zhang
authors.forename: X D
authors.initials: XD
authors.lastname: Yuan
authors.forename: Q S
authors.initials: QS
authors.lastname: Lu
authors.forename: S Q
authors.initials: SQ
authors.lastname: Qin