Abstract
Here we compare different nanoscale waveguiding geometries involving plasmonic materials for subdiffractive propagation at optical frequencies. Deriving closed-form analytical formulas to analyze the different structures, we show how the presence of a plasmonic background may produce robust, highly confined guided wave propagation as compared with the dual setups involving plasmonic particles in a transparent background. Advantages and disadvantages of different scenarios for realizing right-handed and left-handed propagation in one-dimensional (1D) and two-dimensional (2D) waveguides are highlighted and discussed.
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