Terahertz waveguides based on artificial surface plasmons

Abstract

The invention provides a terahertz waveguide based on spoof surface plasmon polaritons (SSPPs), and relates to terahertz waveguides. The terahertz waveguide based on the SSPPs is provided with a medium substrate, wherein a metal film transmission line is arranged on the medium substrate and is a periodically nodule-loaded metal film spoof surface plasmon polariton transmission line; the metal film transmission line is arranged on one or two sides of the medium substrate and is used for guiding terahertz spoof surface plasmon polaritons with extra-high local field binding performance; a periodic unit structure of an artificially designed nodule structure consists of two metal strips, which form an L / T shape, and can be singly loaded on one side of a center strip structure, or can be loaded on two sides of the center strip structure in a symmetry, antisymmetry or offset symmetry manner; the length of the artificially designed nodule structure in a waveguide transmission direction is smaller than the length of a unit of the periodic unit structure.

Description

technical field [0001] The invention relates to a terahertz waveguide, in particular to a terahertz waveguide based on artificial surface plasmons. Background technique [0002] Surface plasmon polaritons (SPPs) are extremely bound surface waves, which can overcome the diffraction limit to achieve sub-wavelength electromagnetic field space confinement. It has great application value in fields such as sensors. Surface plasmons usually only exhibit sub-wavelength local field confinement properties when they are close to the characteristic plasmon frequency of their conductors. The characteristic plasmon frequencies of most metals are in the visible and ultraviolet bands, which leads to the use of metal wires and metal plates. The surface plasmon waveguide of the surface plasmon waveguide extends to the space in the lateral field distribution of lower frequency bands such as microwave, millimeter wave and terahertz, and the confinement performance is poor. Therefore, in order...

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Problems solved by technology

Most of these studies are based on one-dimensional periodic structures, two-dimensional infinite structures or three-dimensional structures with limited thickness, which are often large in size, which limits their applications in highly integrated devices, circuits and systems.

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