Study On The Transmission Characteristics Of The Novel Hybrid Dielectric-loaded Long-Range Surface Plasmon Polaritons Waveguides

Recently, the development of the photonic integrated devices are attracting more and more attention. As the basis of the photonic integrated devices, the optical circuits have been studied widely in recent years. Surface plasmon polaritons (SPPs) is a kind of electromagnetic mode on the metal-dielectric interface. It is the result of interaction between the photon and the free electron which is on the metal surface, thus exhibiting a strong intrinsic confinement in the direction perpendicular to the interface. Moreover, SPPs can also break through the limitation of the diffraction limit. These characteristics make SPP waveguides an ideal structure to constitute the optical circuits of the high integration photonic integrated devices.On the basis of summarizing the previous dielectric-loaded surface plasmon polaritons waveguides and the I-M-I waveguides, This article has presented a novel hybrid dielectric-loaded surface plasmon polaritons waveguides. The novel waveguide is combined with both the merits of the dielectric-loaded surface plasmon polaritons waveguides and the I-M-I waveguides. On this basis, the novel waveguide adopt the raised-cosine structure, which is common in the communication science. Then the field distribution, the normalized mode area, the propagation length, the figures of merit and the coupling length are calculated at the telecom wavelength of λ0=1550nm. Through analysis of these data, it is found that the proposed waveguide had the longer propagation length than the previous dielectric-loaded surface plasmon polaritons waveguides and the I-M-I waveguides. Moreover, with the change of the roll factor a of the relative low index dielectric regions(RLIDRs), the proposed waveguide’s performance doesn’t change greatly, when the a between 0.02 and 0.2, its performance almost has no change. That means the machining error has a negligible impact on the waveguide’s performance and it will have a greater potential in the application. All the simulations in this paper were performed by using rigorous numerical schemes based on finite-element method (FEM).