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Multiple compound surface plasmon-polariton (SPP) waves can be guided by astructure consisting of a sufficiently thick layer of metal sandwiched betweena homogeneous isotropic dielectric (HID) material and a dielectric structurallychiral material (SCM). The compound SPP waves are strongly bound to bothmetal/dielectric interfaces when the thickness of the metal layer is comparableto the skin depth but just to one of the two interfaces when the thickness ismuch larger. The compound SPP waves differ in phase speed, attenuation rate,and field profile, even though all are excitable at the same frequency. Somecompound SPP waves are not greatly affected by the choice of the direction ofpropagation in the transverse plane but others are, depending on metalthickness. For fixed metal thickness, the number of compound SPP waves dependson the relative permittivity of the HID material, which can be useful forsensing applications.

optics communications

Compound surface-plasmon-polariton waves guided by a thin metal layer  sandwiched between a homogeneous isotropic dielectric material and a  structurally chiral material