Graphene-based intermediate infrared plasmon waveguide modulator

Abstract

The invention discloses a graphene-based intermediate infrared plasmon waveguide modulator, and relates to a plasmon waveguide modulator. The modulator is composed of seven layers of structures whichcomprise an upper base, an upper dielectric layer, a bias layer, a middle dielectric layer, a graphene conduction band, a lower dielectric layer and a lower base in sequence from top to bottom; the centers of the upper base and the lower base are provided with symmetrical gradually-deformed protruding structures which extend to the upper dielectric layer and the middle dielectric layer in the middle respectively, the mode binding performance of enhanced waveguide can be achieved, the edges of the upper base and the lower base are provided with parabola type, hyperbola type, elliptic type, sinusoidal type and cosine type curves or other curves capable of achieving base edge gradient modulation, the gradient width is consistent with the width of the parts extending from the upper base and the lower base, modulation of different degrees can be achieved by changing the width, and the upper dielectric layer, the middle dielectric layer and the lower dielectric layer are left on the bias layer and the plane of the graphene conduction band so as to make the bias layer and the plane of the graphene conduction band form corresponding electric fields.

Description

technical field [0001] The present invention relates to a plasmonic waveguide modulator, in particular to a graphene-based mid-infrared plasmonic waveguide modulator. Background technique [0002] Mid-infrared waves (Mid-infrared waves) generally refer to electromagnetic waves with a frequency in the range of 12-120 THz and a wavelength in the range of 2.5-25 μm. Surface plasmons are electromagnetic modes composed of light fields coupled to collective electron oscillations propagating along the interface between metals and dielectrics. In this effect, free electrons oscillate collectively under the irradiation of light waves with the same resonant frequency, forming surface electromagnetic waves of metals and dielectrics. Their field strength is maximum at the interface and decays exponentially along the direction perpendicular to it. Surface plasmons can confine and control electromagnetic waves in the sub-wavelength range, have near-field enhancement properties, and have ...

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Problems solved by technology

However, the waveguide modulators studied at this stage involve more light wave frequency bands and less mid-infrared frequency bands, and most waveguide modulators can only achieve a modulation depth of 3-5dB/μm, even if a higher modulation depth is achieved. At the cost of loss, it is impossible to achieve low-loss long-distance transmi

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