We study the propagation of waves in a new dielectric slab waveguide grating with metamaterial cover. Perturbation theory is used to derive an expression that approximates the transverse coupling coefficient for coupling between deferent Transverse Magnetic (TM)-polarized guided modes in a waveguide with a rectangular grating. We numerically obtain the coupling coefficient of waveguide gratings with a double negative cover and compare with that of conventional waveguides, then we report the unusual properties of this structure. We show that the coupling coefficient of the fundamental mode is disappeared. Also the magnitude of the left-handed waveguide gratings enhances more than one order of magnitude.

Keywords: Coupling coefficient, Metamaterial, Optical waveguide grating.

Full-Text [PDF 325 kb]   (553 Downloads)