Abstract

A self-consistent theoretical model for the optical response of composite metal–dielectric nanorods on the surface of dielectric medium is developed. The modeling of optical properties of evanescent TE- and TH-polarized modes in Otto configuration is presented for experimentally realizable geometries. We show effective control of the absorption spectrum of the modes by tuning the height of plasmonic metal caps on dielectric rods. Configurational resonances can explain the origin of absorption peaks caused by surface wave excitation. These absorption resonances at the infrared spectral range due to surface phonon polaritons can be used for sensing applications similarly to the surface plasmon polaritons at visible wavelengths. Large parameter space of spectral tunability of the surface modes is explored numerically.

© 2014 Optical Society of America

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