Dual-function polarization converter based on graphene DC contact

Abstract

The invention discloses a dual-function polarization converter based on graphene DC contact. The substrate comprises a metal bottom layer, a silicon middle layer and a silicon dioxide surface. The artificial structure is unit structures arranged in an array on the substrate surface. Each unit structure comprises an I-shaped graphene arm and an I-shaped metal arm which are mutually orthogonal and whose centers coincide; the graphene arm is pressed below the metal arm; longitudinal graphene arms are mutually connected; gaps exist between transverse metal arms; the center of the unit structure array is located in the central line of the substrate; 10 to 200 unit structures are in longitudinal and transverse directions, and the numbers are the same; and the I-shaped graphene arms and the I-shaped metal arms are bilaterally symmetrical relative to the longitudinal central line, and are vertically symmetrical relative to the transverse central line. Switching of two functions of linear polarization and circular polarization can be realized without changing structural parameters and without changing bias voltage Vg; the graphene arms are connected in an end-to-end mode to form DC contact, and integrated control on graphene bias voltage is facilitated; the structure is simple, and processing and production are easy; and the conversion efficiency is as high as 99%.

Description

technical field [0001] The invention relates to the field of passive microwave devices and metamaterials, in particular to a dual-function polarization converter based on graphene DC contacts. Background technique [0002] The polarization direction of an electromagnetic wave refers to the instantaneous orientation of its electric field vector when the electromagnetic wave propagates in space. In various antenna systems, as well as microwave and optical instruments and equipment, it is often necessary to switch between different polarization states to obtain a single-polarized or dual-polarized wave. The indicators required by the polarization converter are mainly high performance, low loss, small size, low cost and simple design. [0003] With the rapid development of artificial metamaterial technology, its application in electromagnetic wave propagation is increasing. A variety of polarization converters based on artificial metamaterials have also appeared. The principle...

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Problems solved by technology

[0004] However, the existing polarization converters often only have a single polarization conversion function, such as single-function cross-polarization converters or circular polarization converters.

The recent emergence of polarization converters based on graphene materials can improve the above problems to a certain extent, but there are also some shortcomings, such as complex structures and difficult implementation

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