Surface plasmon polariton waveguide

Abstract

The invention belongs to a waveguide technology and in particular relates to a surface plasmon polariton waveguide. The surface plasmon polariton waveguide comprises a substrate layer, two high-refractive-index dielectric layers, two low-refractive-index dielectric layers and a metal layer, wherein the two high-refractive-index dielectric layers, the two low-refractive-index dielectric layers and the metal layer are arranged above the substrate layer to form a lamination structure which consists of a first high-refractive-index dielectric, a first low-refractive-index dielectric, metal, a second low-refractive-index dielectric and a second high-refractive-index dielectric; and the lamination structure is horizontally placed or vertically laminated on the substrate layer. The surface plasmon polariton waveguide has the advantages that a surface plasmon polariton mode and the conventional slot waveguide mode are mixed; on the basis of the conventional slot waveguide, a central metal layer is added, and by using a metal-dielectrics surface plasmon polariton effect, mode locality is improved; and moreover, by using a thin metal layer long-range surface plasmon polariton effect, the absorption loss of the metal is reduced, so large propagation length of over 1 mm can be obtained.

Description

technical field [0001] The invention belongs to waveguide technology, in particular to a surface plasmon waveguide. Background technique [0002] Surface plasmon waveguide (SPP WG) is one of the ideal candidates for future highly integrated optical circuits. It can confine the mode field to a narrow area on the metal-dielectric surface and break through the diffraction limit of light, thereby greatly reducing the optical density in the waveguide. The mode field area of ​​the field provides the possibility to further reduce the size of future optical path components. At the same time, due to its extremely small mode field area, it can provide extremely high energy density, and can play a huge potential in many nonlinear applications that require high energy density, such as all-optical switches, all-optical wavelength conversion, etc., so in recent years to receive more and more attention. [0003] Surface plasmon waveguides have a wide variety of structures, such as metal ...

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Problems solved by technology

However, its loss still increases with the enhancement of mode field confinement

At the same time, the hybrid surface plasmon waveguide that has been proposed can only obtain a propagation length of the order of 100 μm to 1 mm, and it is difficult to continue to reduce the loss and increase the propagation length to meet the relevant functional requirements of highly integrated optical circuits and all-optical signal processing.

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