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A theoretically study channel plasmon-polaritons (CPPs) with a geometry similar to that in recent experiments at telecommunication wavelengths is
presented here. The CPP modal shape, dispersion relation, and losses are simulated by using the multiple multipole method and the finite
difference time domain technique. It is shown that, with an increase of the wavelength, the fundamental
CPP mode shifts progressively toward the groove opening, ceasing to be guided at the groove bottom and
becoming hybridized with wedge plasmon-polaritons running along the groove edges.
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