Abstract

The lifetime and propagation length of gap surface plasmon polaritons in nanoscopically thin metal-cladded planar dielectric slots are investigated theoretically. It is shown that both can, in principle, be accurately estimated from the width of peaks in angle-resolved spectroscopic data, such as that obtained by the attenuated total reflection experiment. The propagation length is shown to be given by the product of lifetime and group velocity. Their dependence on geometric parameters is investigated and simple long-wavelength limit expressions are derived. Based on these, it is possible to make quick estimates of the lifetime and propagation length for a given structure.

© 2014 Optical Society of America

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