Graphene metasurface used for spin angular momentum deflection in two-dimensional direction

Abstract

The invention discloses a graphene metasurface used for spin angular momentum deflection in a two-dimensional direction. The graphene metasurface is formed by arranging N * N graphene reflection units, and each graphene reflection unit comprises a graphene sticker at the uppermost layer, a quartz dielectric plate at the middle layer and a metal floor at the bottom layer, wherein the graphene sticker is arranged at the central point of the upper surface of the quartz dielectric plate. The rotation angle of each graphene sticker arranged on the upper surface of the quartz dielectric plate is theta, the metal floor is arranged on the lower surface of the quartz dielectric plate, and the central point of each graphene sticker coincides with the central point of the quartz dielectric plate, wherein the theta is an any angle ranging from -90 degrees to 90 degrees. The rotation angle theta of the graphene sticker of each graphene unit arranged on the upper surface of the quartz dielectric plate is determined by the reflection phase distribution at each position of the graphene metasurface. According to the invention, the spin angular momentum and the deflection direction of electromagnetic waves in the two-dimensional direction can be controlled.

Description

technical field [0001] The invention relates to the technical field of microwave communication, in particular to a graphene metasurface used for spin angular momentum deflection in a two-dimensional direction. Background technique [0002] Spin angular momentum (SAM) is a momentum that characterizes the rotational state of an electromagnetic wave, which is related to the polarization state of the electromagnetic wave. Electromagnetic waves have different polarization states and can be used to carry different information, and can also be used for beam splitters to separate beams, etc. Therefore, how to effectively manipulate the SAM of electromagnetic waves has attracted more and more attention from scholars. In order to effectively control SAM, the precise operation of the compensation stage of the reflection interface is essential, but the existing devices used to control SAM in the terahertz (THz) frequency band mostly use gold materials, which are expensive , and if it i...

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Problems solved by technology

[0003] In order to solve the above technical defects, the main purpose of the present invention is to provide a graphene metasurface for spin angular momentum deflection in the two-dimensional direction, which can control the spin angular momentum and deflection direction of electromagnetic waves in the two-dimensional direction , aiming to solve the technical problem of high loss of the entire metal metasurface due to the increase of unit impedance caused by uneven current distribution in the prior art

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