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29 January 2008 Slow and backward waves in plasmonics
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Surface plasmon polariton is a coupled electromagnetic wave and material (electron) density wave. This efficient coupling is the primary means of transforming light to a heavier particle which yields the desired "light slowing". The dispersion curve of surface plasmonic waves exhibits both wave slowing (phase velocity) and light slowing (group velocity). We detail the different avenues for light slowing and reversing (backward propagation) in a plasmonic structure based on a dielectric gap between two metal plates. Light slowing and almost stopping can be achieved as well as the more intriguing effect of backward propagation, accompanied by negative refraction. These effects in plasmonic structures can be used for nano virtual cavities (mirrorless cavities) for ultralow volume sensing as well as generating large local field enhancement.
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Meir Orenstein, Eyal Figenbaum, and Noam Kaminski "Slow and backward waves in plasmonics", Proc. SPIE 6904, Advances in Slow and Fast Light, 69040U (29 January 2008);

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