Competition and evolution of dielectric waveguide mode and plasmonic waveguide mode

Abstract

In order to study the coupling and evolution law of the waveguide mode and two plasmonic surface modes, we construct a line defect waveguide based on hexagonal honeycomb plasmonic photonic crystal. Through adjusting the radius of the edge dielectric rods, the competition and evolution behaviors occur between dielectric waveguide mode and plasmonic waveguide mode. There are three status: only plasmonic waveguide modes occur for r A a ; only dielectric waveguide modes occur for r A > 0.25 a ; two kinds of modes coexist for 0.09 a r A a . The plasmonic waveguide mode has advantages in achieving slow light.