Multi-mode non-diffraction vortex beams enabled by polarization-frequency multiplexing transmissive terahertz metasurfaces

IF 2.7 3区 物理与天体物理 Q2 PHYSICS, APPLIED Journal of Applied Physics Pub Date : 2024-09-09 DOI:10.1063/5.0222832
Mingzhong Wu, Xunjun He, Guangjun Lu, Zhaoxin Geng, Ying Zhang
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Abstract

In terahertz (THz) wireless communication systems, non-diffraction vortex beams carrying an orbital angular momentum (OAM) have attracted extensive attention due to their ability to transmit information over long distances with high capacity. However, existing metasurfaces can only generate a single OAM mode non-diffracting vortex beam at reflection space for circular polarization (CP) incidence, limiting practical applications. To address this issue, we propose and design a polarization-frequency multiplexing transmissive THz metasurface to realize multi-mode non-diffracting vortex beams at linear polarization (LP) incidence. The meta-atom of this metasurface is composed of three anisotropic rectangular metallic structures embedded in vanadium dioxide (VO2) square rings, two circular aperture metallic grid layers, and four dielectric layers. By reasonably designing the size of the metal patch and the state of VO2, the designed metasurface can achieve polarization multiplexing and frequency multiplexing for LP incidence. Based on the phase response of the proposed meta-atoms, the transmissive metasurface can implement not only multi-mode non-diffraction vortex beams but also their space separation at two frequency ranges of 0.80–0.90 THz and 1.50–1.80 THz by changing the state of VO2. Therefore, the proposed multiple multiplexing metasurfaces can effectively shape the wavefront of non-diffraction vortex beams, which have broad application prospects in 6G THz communication.
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利用偏振-频率复用透射太赫兹元表面实现多模非衍射涡旋波束
在太赫兹(THz)无线通信系统中,携带轨道角动量(OAM)的非衍射涡旋光束因其能够长距离、高容量地传输信息而受到广泛关注。然而,现有的元表面只能在圆极化(CP)入射的反射空间产生单个 OAM 模式非衍射涡旋光束,从而限制了实际应用。为解决这一问题,我们提出并设计了一种偏振-频率复用透射太赫兹元表面,以实现线性偏振(LP)入射下的多模非衍射涡旋束。该元表面的元原子由嵌入二氧化钒(VO2)方环的三个各向异性矩形金属结构、两个圆形孔径金属网格层和四个电介质层组成。通过合理设计金属贴片的尺寸和二氧化钒的状态,所设计的元表面可以实现 LP 入射的偏振复用和频率复用。根据所提出的元原子的相位响应,通过改变 VO2 的状态,透射元表面不仅可以实现多模非衍射涡旋光束,还可以在 0.80-0.90 THz 和 1.50-1.80 THz 两个频率范围内实现空间分离。因此,所提出的多重复用元表面能有效地塑造非衍射涡旋束的波面,在 6G 太赫兹通信中具有广阔的应用前景。
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来源期刊
Journal of Applied Physics
Journal of Applied Physics 物理-物理:应用
CiteScore
5.40
自引率
9.40%
发文量
1534
审稿时长
2.3 months
期刊介绍: The Journal of Applied Physics (JAP) is an influential international journal publishing significant new experimental and theoretical results of applied physics research. Topics covered in JAP are diverse and reflect the most current applied physics research, including: Dielectrics, ferroelectrics, and multiferroics- Electrical discharges, plasmas, and plasma-surface interactions- Emerging, interdisciplinary, and other fields of applied physics- Magnetism, spintronics, and superconductivity- Organic-Inorganic systems, including organic electronics- Photonics, plasmonics, photovoltaics, lasers, optical materials, and phenomena- Physics of devices and sensors- Physics of materials, including electrical, thermal, mechanical and other properties- Physics of matter under extreme conditions- Physics of nanoscale and low-dimensional systems, including atomic and quantum phenomena- Physics of semiconductors- Soft matter, fluids, and biophysics- Thin films, interfaces, and surfaces
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