Abstract
We investigate theoretically and numerically a graphene parallel-plate waveguide structure with two alternate chemical potentials (which can be realized by alternately applying two biased voltages to graphene). A plasmonic Bragg reflector can be formed in infrared range because of the alternate effective refractive indexes of SPPs propagating along graphene sheets. By introducing a defect into the Bragg reflector, and then the defect resonance mode can be formed. Thanks to the tunable permittivity of graphene by bias voltages, the central wavelength and bandwidth of SPPs stop band, and the wavelength of the defect mode can be tuned.
Highlights
Surface plasmon polaritons (SPPs), showing the capability of overcoming the diffraction limit of light, is regarded as a potential information carrier for generation integrated photonic circuits.[1]
We investigate theoretically and numerically a graphene parallel-plate waveguide structure with two alternate chemical potentials
A plasmonic Bragg reflector can be formed in infrared range because of the alternate effective refractive indexes of SPPs propagating along graphene sheets
Summary
Surface plasmon polaritons (SPPs), showing the capability of overcoming the diffraction limit of light, is regarded as a potential information carrier for generation integrated photonic circuits.[1]. Kerr nonlinear MIM waveguides are proposed and investigated to achieve tunable SPPs band gap.[13] Despite all this, actively controlling plasmonic Bragg gratings has not been solved well Such as super-resolution,[16,17] antenna,[18] cloaking,[19,20] plasmonic absorbers,[21] filters[22] and sensor.[23] In addition, the strong coupling of SPPs in monolayer graphene sheet array[24] has been analyzed theoretically and based on the three-layer graphene coupling system,[25] the optical splitter, spatial switch,[26] and directional coupler[27] working deeply under the diffraction limit have been constructed and demonstrated systematically. The peak wavelength of the defect mode can be tuned
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