Coupling of near-grazing microwave photons to surface plasmon polaritons via a dielectric grating
Hibbins, Alastair P.
Sambles, J. Roy
Lawrence, Christopher R.
Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
American Physical Society
A dielectric grating on top of a planar metal substrate is shown to couple near-grazing microwave photons to surface plasmon polaritons (SPPs). It is shown that when the grating grooves are oriented such that they are parallel to the plane of incidence (φ=90°), coupling to SPPs with both s- and p-polarized photons is possible at three different energies. It is demonstrated that one mode is coupled via p-polarized radiation and the other two modes are both coupled via s-polarized radiation. A multilayer, multishape differential grating theory allows the identities of each of the modes to be confirmed by modeling the electromagnetic fields above the metal substrate. In addition, a comparison between the experimentally derived reflectivity scans and the theoretical model is made.
Defence Evaluation and Research Agency (DERA), Farnborough
Copyright © 2000 by the American Physical Society
Vol. 61 (5), pp. 5900-5906