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Graphene-dielectric composite metasurface-based reflection type broadband polarization controller

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

Active Publication Date: 2020-02-14
NANKAI UNIV
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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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  • Graphene-dielectric composite metasurface-based reflection type broadband polarization controller
  • Graphene-dielectric composite metasurface-based reflection type broadband polarization controller
  • Graphene-dielectric composite metasurface-based reflection type broadband polarization controller

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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 present invention relates to a graphene-dielectric composite metasurface-based reflection type broadband polarization controller, and belongs to the technical field of novel artificial electromagnetic materials and terahertz science. The polarization controller comprises a four-layer structure, wherein the lowermost layer is a metal substrate (1), the middle is a low-refractive-index dielectric (2), and the uppermost layer is a high-refractive-index dielectric metasurface array (3) embedded in the low-refractive-index dielectric (2); and meanwhile, the upper surface of the metasurface array is exposed in air, and uniform single-layer graphene (4) is arranged between the low-refractive-index dielectric layer and the high-refractive-index dielectric metasurface. A bias voltage control device (5) is arranged between the graphene layer (4) and the metal substrate (1), so that linearly polarized light is converted into orthogonal linearly polarized light or circularly polarized light ina certain frequency range by changing the conductivity of graphene. The reflection type broadband polarization controller 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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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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