Discrete Talbot effect in dielectric graphene plasmonic waveguide arrays

We theoretically predict and numerically simulate the discrete plasmonic Talbot effect in dielectric graphene plasmonic waveguide (DGPW) arrays at THz wavelengths. The super-modes in DGPW arrays are analyzed by using super-mode theory and the field intensity distributions in the designed DGPW arrays are explained by the superposition of different super-modes and simulated by using commercial software (COMSOL) based on finite element method (FEM). The discrete plasmonic Talbot effect is realized by superposition of different super-modes. The Talbot distance can be actively tuned by varying the Fermi energy of graphene and it decreases monotonically with increasing Fermi energy. In addition, it is found that the Talbot distance increases with the period of the DGPW arrays. Simulation results show a good agreement with the theoretical analysis.

As shown in the above Figure (a), the N-channel dielectric graphene plasmonic waveguide (DGPW) arrays are designed. Based on super-mode theory, the discrete Talbot effect in the designed DGPW arrays can be obtained by the superposition of different super-modes. Figure (b) shows Intensity distributions as the input pattern are given by {1, 0, 1, 0, 1, 0, 1}, {1, 0, 0, 1, 0, 0, 1}, and {1, 0, −1, 0, 1, 0, −1}, respectively.145