In this letter, we compare the effective index method (EIM), applied to derive an analytical model of the guidance properties of plasmonic groove waveguides, to full-wave simulations based on finite integration technique (FIT). We apply our results to different plasmonic groove geometries, with particular attention to the triangular (V-groove) waveguide. We first approximate the V-groove geometry with a multiple-sections rectangular-stepped waveguide, for which EIM may be applied in closed form. Explicit formulas for the dispersion properties are given in terms of a set of transcendental equations, which are then solved with standard numerical complex-zeros-searching routines. Our numerical results are then compared and validated with FIT full-wave simulations, showing the range of validity of EIM and providing an efficient analytical description and physical insights into the guided propagation in V-groove plasmonic waveguides.

Guidance Properties of Plasmonic Nanogrooves: Comparison Between the Effective Index Method and the Finite Integration Technique / Polemi, Alessia; A., Alu’; N., Engheta. - In: IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS. - ISSN 1536-1225. - STAMPA. - 10(2011), pp. 199-202. [10.1109/LAWP.2011.2126554]

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