Propagation of surface hybrid modes on a system consisting of metal-air-metal cylinder has been investigated theoretically. The effect of increasing the interwall spacing between two metals on plasmon dispersion relation is shown. The dispersion relation can lead to a simple equation for m = 0. Calculations show that the plasmon energy of this structure depends on the interwall spacing between two metals.
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Bahari et al. (2012) studied this question.
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