Open AccessPhase modulation of surface plasmon polaritons by surface relief dielectric structures
Author(s) -
Qian Wang,
Xiaocong Yuan,
P. S. Tan,
Douguo Zhang
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.019271
Subject(s) - optics , surface plasmon polariton , materials science , surface plasmon , phase modulation , dielectric , phase (matter) , modulation (music) , refractive index , electric field , fresnel equations , plasmon , optoelectronics , physics , quantum mechanics , phase noise , acoustics
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.