Surface Plasmons of a Graphene Parallel Plate Waveguide Bounded by Kerr-type Nonlinear Media

The exact dispersion relations of the transverse magnetic surface plasmons (SPs) supported by a graphene parallel plate waveguide (PPWG), surrounded on one or both sides by Kerr-type nonlinear media, are obtained analytically. It is shown that if self-focusing nonlinear materials are chosen as the surrounding media, the SPs localization length (LL) is decreased, while their propagation length (PL) remains unchanged, as compared to those of a typical graphene PPWG. Moreover, PL and LL of the SPs are considerably affected by adjusting nonlinear parts of the dielectric permittivities of the nonlinear media. It is found that using an appropriate defocusing nonlinear material as a substrate of the graphene PPWG, which is surrounded on one side by the nonlinear medium, leads to noticeable enhancement of the propagation and localization characteristics of the surface plasmons. The results presented here can be useful for enhancing capabilities of plasmonic devices based on the graphene PPWG for sensing and waveguide applications

Nonlinear optical properties of biexciton states in GaN quantum disks

42.65.-k Nonlinear optics, 78.67.-n Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures, 42.55.Sa Microcavity and microdisk lasers,

Surface Optical Waves in Semi-Infinite One-Dimensional Photonic Crystals Containing Alternating Layers of Positive and Negative Media

An analytical direct matching procedure within the Kronig-Penney model was applied to analyze the dispersion behavior of the localized surface states supported at the surface of a semi-infinite one-dimensional photonic crystals truncated with air or a cap layer. The photonic crystals contain alternating layers of positive and negative media. The present study demonstrates that by choosing some proper value for the photonic crystal parameters, zero and negative dispersion of surface modes emerge in a large range of parallel wave vector. New forward and backward surface waves are introduced. Due to the different nature of the band structure the surface modes are more localized compared to those appearing in the conventional photonic crystals

Surface Optical Waves in Semi-Infinite One-Dimensional Photonic Crystals Containing Alternating Layers of Positive and Negative Media with a Cap Layer

An analytical direct matching procedure within the Kronig-Penney model was applied to analyze the dispersion behavior of the localized surface states supported at the surface of a semi-infinite one-dimensional photonic crystals truncated with air or a cap layer. The photonic crystals contain alternating layers of positive and negative media. The present study demonstrates that by choosing some proper value for the photonic crystal parameters, zero and negative dispersion of surface modes emerge in a large range of parallel wave vector. New forward and backward surface waves are introduced. Due to the different nature of the band structure the surface modes are more localized compared to those appearing in the conventional photonic crystals