Abstract
In the paper, we investigate the feasibility of restraining the diffraction of propagating surface plasmon polaritons in nanoscale metal waveguide arrays (MWGAs). Based on the dispersion relation of MWGAs, two methods, tailoring the input end interface of the MWGAs and the surrounding medium and augmenting the wave vector of exciting light by auxiliary MWGAs, are proposed to excite the non-diffraction mode of MWGAs. All theoretical predictions are well demonstrated by the finite-difference time-domain numerical simulations.
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