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Plasmon Induced Transparency in Graphene-based Side Coupled two Rectangular Nano-cavities-like structures
摘要： We investigate numerically the plasmon analogue of electromagnetic induced transparency (EIT) in a compact graphene-based waveguide coupled to two rectangular nano-cavities-like structures made out of graphene nanoribbons. The cavities are placed symmetrically on each side of the bus waveguide, giving rise to a V-like state in analogy with three level atomic systems. In this configuration, the cavities are directly coupled to the waveguide, and consequently both play the role of the bright mode. By slightly detuning the Fermi energy level of the cavities, we show the possibility of generating a narrow transparency window, that’s, the plasmon induced transparency (PIT). The resonance peak occurs as a consequence of destructive interference between the cavities acting like coupled radiative oscillators. We also demonstrate that by appropriately shifting (symmetrically) the Fermi energy levels of the cavities, one could dynamically tune the resonance peak frequency. The proposed structure may help the design of highly integrated optical devices.
关键词： Nanomaterials,Plasmon induced transparency,Graphene waveguide,Metamaterials,Surface plasmons
更新于2025-09-19 17:13:59
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Semi-implicit FDTD TW scheme for modelling effective surface plasmons
摘要： A semi-implicit finite-difference time-domain thin-wire (TW) scheme with a relaxed stability condition is proposed for modelling effective surface plasmons in waveguide metamaterials. Its formulation is based on introducing the Newmark-Beta method into the TW formulation based on the contour-path integral of Maxwell’s equations around a wire. The resultant scheme is magnetically implicit. Its stability, accuracy and efficiency are assessed in the application to a wire-added parallel-plate waveguide perturbed with a small gap.
关键词： Newmark-Beta method,surface plasmons,semi-implicit FDTD,thin-wire scheme,waveguide metamaterials
更新于2025-09-04 15:30:14