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We investigate surface plasmon modes supported by flat-top silvernano-ridges. We calculate the mode electromagnetic field distribution, thedispersion curve, the travel range, and the figure-of-merit of the nano-ridgemode. We find that the nano-ridge surface plasmon modes are quasi-TEM modeswith longitudinal field components three orders of magnitude smaller than thetransverse field components. The quasi-TEM nature of mode profiles reveals thatthe propagation of free electron oscillations on the top of the nano-ridgecontributes mainly to the tightly confined ridge mode. We also find that as thewidth of the nano-ridge decreases, the ridge mode becomes more tightly confinedon the ridge top. As the width of the nano-ridge increases, the nano-ridge modeapproaches two decoupled right-angle wedge plasmon modes.

Mode Properties of Flat-top Silver Nano-ridge Surface Plasmon Waveguides