Abstract

The propagation of a surface plasmon polariton on a planar metal surface perturbed by $N$ equally spaced rectangular grooves, each with the same width but with varying depths, is investigated by the finite-difference time-domain method. For a linear dependence of the depth of the $n$th groove on $n$, the transmissivity of the surface plasmon polariton and of the power radiated into the vacuum above the surface, as functions of its frequency, consist of $N$ equally spaced dips and peaks, respectively. These are the signatures of the surface plasmon polariton analog of a Wannier–Stark ladder.

© 2014 Optical Society of America

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