Artificial surface plasmon waveguide based on symmetrical period of loop-shaped branch structure

Abstract

The invention discloses an artificial surface plasmon waveguide based on a symmetrical period of a loop-shaped branch structure, and relates to an artificial surface plasmon waveguide. The waveguide comprises a dielectric substrate. A metal structure is arranged on one side of the dielectric substrate. The metal structure is provided with a coplanar waveguide feed structure, an intermediate artificial surface plasmon waveguide transmission structure and an artificial surface plasmon transition structure. The artificial surface plasmon transition structure is arranged between the coplanar waveguide feed structure and the intermediate artificial surface plasmon waveguide transmission structure. The coplanar waveguide feed structure is located at the two ends of the dielectric substrate. Theprogressive frequency is reduced, and the binding property of electromagnetic waves is enhanced. The method has important significance for reducing the size of the planar SSPP waveguide. The passbandrange can be changed by adjusting the size of the side length of a homocentric-squares-shaped branch knot. The advantages of small size, easy machining, high transmission rate and the like are achieved.

Description

technical field [0001] The invention relates to an artificial surface plasmon waveguide, in particular to an artificial surface plasmon waveguide based on a symmetrical period of a zigzag structure. Background technique [0002] Surface Plasmon Polaritons (SPPs) are electron density waves propagating along the metal surface formed by the interaction between the external electromagnetic field and the free electrons in the metal surface region. Since metals have a negative dielectric constant in the optical band, according to the boundary conditions of the electromagnetic field, it can be proved that there are surface plasmons in the optical band on the metal surface. Surface plasmons have two obvious characteristics. First, the wave vector in the propagation direction is larger than the light wave vector. Second, in the direction perpendicular to the propagation direction, the field decays exponentially and has high confinement. This unique transmission characteristic is ver...

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Problems solved by technology

[0004] However, most of the artificial surface plasmon waveguides currently reported use linear branches or grooves, which have poor confinement of electromagnetic waves, are often large in size, and have low transmission rates, making them difficult to put into practical use.

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