Yüzey plazmonları üzerindeki yerel olmayan etkiler ve yeni uygulamaları: Nano ölçekli plazmonik yapılar

In this study, we have explored the surface plasmon theory with Bloch hydrodynamic model and compared the results with Drude model to point out the advantage of the non-local models over free electron models at higher frequencies, especially around the plasma frequency. We have then shown how this model affects the extraordinary transmission of light through a single subwavelength slit embedded in a metal layer. By obtaining the dielectric constant of the metals with Bloch model, we consider the interrelated effects between the field and the material which the field impinges on. We have reported the differences between Bloch and Drude models in the permittivity of the metal medium and we have shown how these differences affect the surface plasmon excitation and dispersion relation for a two-layered medium of dielectric-metal qualitatively and quantitatively. We have recalculated the effective refractive index of the slit embedded in a metal layer with Bloch's hydrodynamic model and shown the differences with Drude model. We have then determined the transmission of light through metallic nano-apertures in a metal layer whose dielectric response modeled by Drude and Bloch models to show how non-local models predict the transmittance behavior of subwavelength apertures more realistically than free-electron models and we have shown how Bloch model contributes in controlling light transmission through nano-slits. Bloch model gives the advantage that, we can control the transmittance behavior of nano-apertures by changing the material parameters defined by Bloch model. This advantage has been used to design new nano-circuit elements for beam shaping and tilting using subwavelength systems. We have shown how we control the focusing and deflecting mechanisms by changing the material characteristics modeled by Bloch's hydrodynamic model.