Analysis of a tunable band-pass plasmonic filter based on graphene nanodisk resonator

A plasmonic filter based on graphene ribbons coupled with a graphene nanodisk resonator was proposed. According to the theory of disk cavity, the resonance frequencies can be manipulated by changing the radius of the disk, which is in agreement with the results obtained by our study. Electrical tunability of this filter by tiny change of the chemical potential of the graphene was confirmed. In addition, the bandwidths of resonance spectra are tunable by changing the coupling distance between the graphene nanodisk and nanoribbon. This work provides an effective method for designing graphene based ultra-compact devices for optical communication. (C) 2014 Elsevier B.V. All rights reserved.