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A reflective broadband polarization controller based on graphene-dielectric composite metasurface

A polarization controller and metasurface technology, applied in instruments, optics, optical components, etc., can solve the problems of high loss and low metal metasurface efficiency, and achieve the effect of easy design and processing and high integration.

Active Publication Date: 2021-03-09
NANKAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the common problems of low efficiency and large loss of metal metasurfaces are still accompanied by their dynamic response process.

Method used

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  • A reflective broadband polarization controller based on graphene-dielectric composite metasurface
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  • A reflective broadband polarization controller based on graphene-dielectric composite metasurface

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Embodiment Construction

[0029] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0030] A reflective broadband polarization controller based on a graphene-dielectric composite metasurface, including a four-layer structure, in figure 1 In the specific embodiment shown, the bottom layer is a gold substrate (1), the middle layer is a low-refractive index medium PMMA (2), and the top layer is a silicon rectangular column metasurface array (3) embedded in PMMA (2). The PMMA layer and Uniform single-layer graphene (4) is between the silicon dielectric pillar metasurface...

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Abstract

The invention relates to a reflective broadband dynamic polarization controller based on a graphene-dielectric composite metasurface, belonging to the fields of new artificial electromagnetic materials and terahertz science and technology. The polarization controller includes a four-layer structure, the bottom layer is a metal substrate (1), the middle is a low refractive index medium (2), and the top layer is a high refractive index medium metasurface array (3) embedded in a low refractive index medium (2). ), while the upper surface of the metasurface array is exposed to the air, and there is a uniform single-layer graphene between the low-refractive index medium layer and the high-refractive index medium metasurface (4). A bias voltage control device (5) is provided between the graphene layer (4) and the metal substrate (1), and by changing the conductivity of the graphene, the linearly polarized light is converted into orthogonal linearly polarized light or circular polarized light within a certain frequency range. polarized light. The invention integrates the dual functions of a half-wave plate and a quarter-wave plate, and has the advantages of high efficiency, simple structure, easy integration and the like.

Description

technical field [0001] The invention relates to a reflective broadband polarization controller based on a graphene-dielectric composite metasurface, and belongs to the fields of new artificial electromagnetic materials and terahertz science and technology. Background technique [0002] A metasurface is a periodic or quasi-periodic two-dimensional array of subwavelength artificial structural units. By changing the size, shape, and direction of the unit, the amplitude, phase, and polarization of scattered light can be precisely controlled, and key functions such as beam steering, focusing, holographic imaging, polarization control, and optical stealth can be realized in ultra-thin structures. Compared with traditional curved surface elements that rely on phase accumulation, metasurface devices are flexible in design, highly integrated, and easy to process. In order to focus beams to sub-wavelength scales and control the resonant frequency through structural parameters, metal-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/01G02B1/00
CPCG02B1/002G02F1/0136
Inventor 关胜男程洁嵘陈铁红常胜江
Owner NANKAI UNIV
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