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Waveguide modes propagating along the circular-cylinder silver nanowire on a silica substrate are calculated and studied using an in-house developed full-vector finite-element imaginary-distance beam propagation method (FV-FE-IDBPM). In particular, leaky-mode characteristics for the mode with field guided mainly at the top air-silver interface and that with field distributed mainly near the silver-substrate...
An in-house developed full-vector finite-element imaginary-distance beam propagation method (FV-FE-ID-BPM) is employed to calculate the modes of a surface plasmon metal-stripe waveguide. Leaky modes, which possess less propagation losses compared with corresponding bound modes, are particularly studied. The calculated real and imaginary parts of the modal effective indices are shown to be with local-overshoot...
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