title: Tuned switching of surface waves by a liquid crystal cap layer in one-dimensional photonic crystals.
abstract: In this paper, we theoretically study the electromagnetic surface waves localized at the interface between a homogeneous dielectric medium and a semi-infinite, one-dimensional photonic crystal (1D PC). The semi-infinite 1D PC is made of alternative layers of right-handed (RH) and dispersive left-handed (LH) materials in the presence of a liquid crystal (LC) cap layer. In this structure, we derive the surface waves dispersion relation with tunable switching and localization by using an analytical direct matching procedure within the Kronig-Penny model. It is shown that, for both of layer arrangements, the variation of molecules orientation of the LC cap layer acts as an effective tool to tune the type (tuned switching) and localization of the surface waves and it also can create a surface mode with maximum localization in the first frequency bandgap.
authors.affiliation: Department of Solid State Physics, Physics Faculty, University of Tabriz, Tabriz, Iran.
authors.forename: Hodjat
authors.initials: H
authors.lastname: Hajian
authors.forename: Behrooz
authors.initials: B
authors.lastname: Rezaei
authors.forename: Ali Soltani
authors.initials: AS
authors.lastname: Vala
authors.forename: Manoochehr
authors.initials: M
authors.lastname: Kalafi