Graphene nanoribbons (GNRs) are envisioned to play an important role in improving confinement of surface plasmon resonance. Here, a coupled graphene-cavity-waveguide (GCW) system is proposed to investigate the characteristics of the resonant modes with finite difference time domain (FDTD) method. It is found that the surface plasmon characteristics can be modulated with the change of geometrical parameters of the structure and physical parameters of graphene. The resonant wavelength is sensitive to the Fermi level; and the resonant depth can be adjusted by the altering of carrier mobility. Moreover, the quality factor can be affected by the separation of cavity-cavity. The proposed GCW coupling system has potential applications in graphene-based integrated nanophotonic devices, optical filters, slow light and other active photonic devices.
The paper proposes a graphene/metal sensing film assisted optical fiber as a graphene plasmonic waveguide biosensor. The enhanced graphene surface plasmon can promote the tunable sensitivities in both intensity and wavelength. The effective mode index, leakage loss and effective mode area properties for graphene/metal film assisted optical fiber are studied. There is a big interaction between raphene/metal sensing film and optical fiber in the region round wavelength 590nm. Graphene based hybrid plasmonic waveguide sensor can realize the highly sensitive, highly integrated, flexible, and miniaturized prospect in sensing application.
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