Surface plasmons in layered structures with semiconductor and metallic films

Abstract

The complete spectrum of eigenwaves including surface plasmon polaritons (SPP), dynamic (bulk) and complex waves in the layered structures containing semiconductor and metallic films has been explored. The effects of loss, geometry and the parameters of dielectric layers on the eigenmode spectrum and, particularly, on the SPP modes have been analysed using both the asymptotic and rigorous numerical solutions of the full-wave dispersion equation. The field and Poynting vector distributions have been examined to identify the modes and elucidate their properties. It has been shown that losses and dispersion of permittivity qualitatively alter the spectral content and the eigenwave properties. The SPP counter-directional power fluxes in the film and surrounding dielectrics have been attributed to vortices of power flow, which are responsible for the distinctive features of SPP modes. It has been demonstrated for the first time that the maximal attainable slow-wave factor of the SPP modes guided by thin Au films at optical frequencies is capped not by losses but the frequency dispersion of the actual Au permittivity.

Losses of Slow Interface Waves in Plasmonic and Spintronic Structures

“…where 0, k0, e, t, a and S(y, W) are defined in ( 5), (12) and (11), and nonreciprocity of the SW power flow is determined by Wm(e,a/t) which depends on …”

“…This results in Lm() being reduced to m() and DE ( 9) becoming (2) for SPPs in isotropic plasmonic layer. Spectrum of TM waves in a magnetised plasma layer includes the dynamic waves and MPs [9]- [12]. The dynamic waves are the conventional surface waves guided by the central layer at Ree() > max(1, 2) only.…”

“…MPs exist in the two frequency bands and have the resonance cut-offs at the upper bound of each band. In these two bands, MPs travelling in the same direction are guided by the opposite interfaces of the magnetised plasma layer due to the opposite signs of Re{at [12]. For example, if a MP is attached to the upper interface of the plasma layer shown in Fig.…”