Dimensional confinement and waveguide effect of Dyakonov surface waves in twisted confined media

Abstract

We theoretically study Dyakonov surface waveguide modes that propagate along the planar strip interfacial waveguide between two uniaxial dielectrics. We demonstrate that owing to the one-dimensional electromagnetic confinement, Dyakonov surface waveguide modes can propagate in the directions that are forbidden for the classical Dyakonov surface waves at the infinite interface. We show that this situation is similar to a waveguide effect and formulate the resonance conditions at which Dyakonov surface waveguide modes exist. We demonstrate that the propagation of such modes without losses is possible. We also consider a case of two-dimensional confinement, where the interface between two anisotropic dielectrics is bounded in both orthogonal directions. We show that such a structure supports Dyakonov surface cavity modes. Analytical results are confirmed by comparing with full-wave solutions of Maxwell’s equations. We believe that our work paves the way toward new insights in the field of surface waves in anisotropic media.

Поверхностные Электромагнитные Волны Дьяконова На Границе Раздела Анизотропных Двуосных Кристаллов

“…При этом анализировались лишь некоторые частные случаи границ раздела двуосных кристаллов при относительно простых пространственных ориентациях их оптических осей. Кроме того, в литературе изучались и другие разновидности волн Дьяконова, существование которых возможно на границах раздела других типов веществ, таких, как гиперболические, хиральные и бианизотропные материалы [16][17][18][19], а также возникающих в ограниченных средах [20][21][22][23].…”

Dyakonov Surface Waves at the Boundary of Anisotropic Biaxial Crystals

“…Only some particular cases of biaxial crystal interfaces with relatively simple spatial orientations of their optical axes were analyzed. In addition, other varieties of Dyakonov waves, the existence of which is possible at the interfaces of other types of substances, such as hyperbolic, chiral and bianisotropic materials [16][17][18][19], as well as arising in limited media [20][21][22][23] have been studied in the literature.…”

Dyakonov surface waves in dielectric crystals with negative anisotropy

“…Very recently, a practically important case of Dyakonov-like surface waves in finite-size resonator structures has been studied for cylindrical waveguides [34,35] as well as for flat interfacial strip waveguides [36,37]. It has been demonstrated that due to a non-zero curvature of cylindrical waveguides, Dyakonov surface waveguide modes (DSWMs) in them inevitably have radiative losses.…”