Abstract

Here, we take the advantage of the strong electromagnetic field of surface plasmon polaritons (SPPs) on graphene to design a tunable terahertz plasmonic Bragg reflector by the intensity of propagating SPP wave. A periodic variation in the effective mode index of SPPs in the direction of their propagation on a graphene layer, required for Bragg scattering, is created by a properly designed silicon\silicon dioxide substrate. A small change in the applied voltage between the graphene sheet and the substrate leads to a noticeable tuning of the stopband region of the reflector. Deposition of a Kerr nonlinear medium on the substrate and in the immediate vicinity of the graphene layer is employed to control the propagation characteristics of SPPs by their intensity. Our numerical simulation results via a developed nonlinear finite difference time domain method reveal that by increasing the SPP wave intensity up to 0.9 ${\bf MW}/{\bf cm}^2 $ which is below the damage threshold of graphene, a red shift in the Bragg frequency up to 220 GHz is achievable. Valuable potential applications can be envisioned for this Bragg reflector as filters and switches due to its fast and high level of tunability with applied gate voltage and the intensity of propagating SPP wave.

© 2015 IEEE

PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription