Switching of surface plasmon-polariton transmittance through the graphene stub nanoresonator with quantum dot

In this work we study a switching effect for surface plasmon-polariton (SPP) transmittance through a graphene waveguide integrated with the stub nanoresonator and loaded with a core-shell quantum dot (QD). For this aim, the... [ view full abstract ]

In this work we study a switching effect for surface plasmon-polariton (SPP) transmittance through a graphene waveguide integrated with the stub nanoresonator and loaded with a core-shell quantum dot (QD). For this aim, the geometry of the nanoresonator is optimized for realization of effective interaction of SPP modes with the QD. For obtaining of the switching effect we suggest to use two SPP waves, one of them is the signal SPP wave, propagation through the system, and another is a SPP wave that manages excited states of the QD. We show that in the regime of strong nonlinear interaction the effective control the phase shift of the signal SPP via variation of the power of the manage SPP wave can be obtained. With increasing of the phase shifts of signal SPP the transmission ability of the nanoresonator can significantly change. In particular, we demonstrate that it is possible to get dramatic increase in transmittance of the signal SPP from 0 to 90% applying the managing SPP.
From the practical point of view, we consider the switching of SPP at a wavelength of 1.55 um in a system with 5 nm InN/GaN core-shell QD, loaded in few nm width graphene stub. Using FDTD simulation of the time evolution of the signal and managing SPP waves in graphene nanostructure, the complete agreement of numerical results with our analytical solutions is demonstrated.
The proposed model can be used for development of all-plasmonic transistors and new processors architecture for the near-infrared spectral rang. In addition the achievement of high-temperature superconductivity of graphene can provide conditions for realization of the lossless plane circuits based on the SPP propagation.