Abstract
We study the nonlinear dispersion and coupling properties of the graphene-bounded dielectric slab waveguide at near-THz/THz frequency range, and then reveal the mechanism of symmetry breaking in nonlinear graphene waveguide. We analyze the influence of field intensity and chemical potential on dispersion relation, and find that the nonlinearity of graphene affects strongly the dispersion relation. As the chemical potential decreases, the dispersion properties change significantly. Antisymmetric and asymmetric branches disappear and only symmetric one remains. A nonlinear coupled mode theory is established to describe the dispersion relations and its variation, which agrees with the numerical results well. Using the nonlinear couple model we reveal the reason of occurrence of asymmetric mode in the nonlinear waveguide.
Highlights
We study the nonlinear dispersion and coupling properties of the graphene-bounded dielectric slab waveguide at near-THz/THz frequency range, and reveal the mechanism of symmetry breaking in nonlinear graphene waveguide
Based on its unique electric and optical properties[1] graphene has been suggested as an alternative to conventional metal-based structures to confine light and guide surface plasmon polaritons
Electromagnetic properties of graphene-dielectric composite structures have attracted special attention in the past years, leading to the rapid development of a new branch of plasmonics known as graphene plasmonics[2,3,4,5]
Summary
We study the nonlinear dispersion and coupling properties of the graphene-bounded dielectric slab waveguide at near-THz/THz frequency range, and reveal the mechanism of symmetry breaking in nonlinear graphene waveguide. Based on its unique electric and optical properties[1] graphene has been suggested as an alternative to conventional metal-based structures to confine light and guide surface plasmon polaritons. The demonstration of surface plasmon excitation in graphene based on the near-field scattering of infrared light has been reported[13,14]. A novel class of nonlinear self-confined modes originated from the hybridization of surface plasmon polaritons with graphene optical soliton is demonstrated to exist in graphene monolayers[25]. For the nonlinear graphene-dielectric-graphene structure[26], the symmetric, antisymmetric and asymmetric mode were found in the structure. The occurrence of asymmetric mode means the symmetry breaking www.nature.com/scientificreports/
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
