Graphene surface plasmon polariton (SPP) propagation device of periodic grating structure

Abstract

The invention discloses a graphene SPP propagation device of a periodic grating structure. The device is characterized by comprising a silicon dioxide substrate layer and a graphene layer, and a periodic grating structure is etched on the upper surface of the silicon dioxide substrate layer; an organic dye gain medium is arranged in the ridge of the periodic grating structure; the graphene layer is of an array nanobelt structure; the upper surface of the silicon dioxide substrate layer is in lap connection with the graphene layer of the array nanobelt structure. According to the graphene SPP propagation device of the periodic grating structure, SPP resonance can be enhanced, the periodic graphene SPP waveguide propagation distance is increased, the structure is simple, and the device is easy to realize.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a propagation device of graphene surface plasmons with a periodic grating structure. Background technique [0002] Surface plasmon polariton (SPP) is an electromagnetic mode between a light wave and a migratable surface charge realized by changing the subwavelength structure of the metal surface, which can support the surface plasmon wave transmitted at the interface between the metal and the medium. Light energy is thus transmitted without being limited by the diffraction limit. Because of this unique property of SPP, it plays an important role in manipulating light energy at the nanometer level. Graphene, which is only one atom thick, has been considered as the "successor" of silicon because of its high strength, high thermal conductivity and electrical conductivity. With the rapid rise of research on graphene materials in recent years, SPP transmission can be re...

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Problems solved by technology

However, the above structure will significantly reduce the graphene carrier mobility after photolithography, which reduces the SPP propagation distance and localization degree, and the quality factor is too low

[0003] Through search and novelty search, it is found that most of the graphene SPP waveguides with periodic structures have weakened the SPP localization effect to a certain extent, and the propagation distance is limited.

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