Phase modulation of surface plasmon polaritons by surface relief dielectric structures.

Phase modulation of surface plasmon polaritons (SPPs) is studied as a function of geometric length and thickness of surface relief dielectric structures on a metal film. The results indicate that the SPPs are analogous to conventional free-space light waves in terms of phase modulation by geometric sizes and refractive indices. An SPP Fresnel zoneplate is considered as an example to employ the phase modulation method for focusing enhancement at the focal point. It is found that the phase modulation optimized zoneplate has obtained 130% higher electric field intensity at the focal point than that of an amplitude-modulated zoneplate.

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