Stopping Surface Magneto-Plasmons By Non-Reciprocal Graded Waveguides

We present that the guided surface magneto-plasmons (SMPs) can be finely tailored and truely stopped at specific location in a class of non-reciprocal graded waveguide system. By examining the dispersion properties of SMPs, the one-way propagating wave stops eventually at the band edge in the proposed waveguide system, where the group velocity vanishes. Meanwhile, the stopped location can be readily tuned by an external static magnetic field. Numerical calculations on the group velocity of propagating SMPs and the spatial field distribution are employed to verify the formation of hotspots. The impact of intrinsic absorption as well as fabrication disorder involved in the realistic waveguide structure is also investigated. The results may suggest an effective method for fast modulation on wave harvesting and energy concentration through external magnetic field. (C) 2021 Elsevier B.V. All rights reserved.