基于石墨烯超表面天线的太赫兹动态相位调控及波束扫描
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中国科学院深圳先进技术研究院

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深圳市基础研究学科布局项目(JCYJ20180507182444250),深圳市基础研究面上项目(JCYJ20220531100206014)

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Terahertz graphene antennas for dynamic phase modulation and beam steering
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Affiliation:

Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences

Funding:

This project is supported by the Shenzhen Research Foundation (JCYJ20180507182444250,JCYJ20220531100206014).

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    摘要:

    太赫兹波处于毫米波和红外光之间,具有诸多优异特性。太赫兹天线是太赫兹通信、雷达和成像等应用系统中的核心元器件。然而,目前报道的太赫兹天线均无法满足大动态范围的相位扫描、高效率辐射和大偏转角度的需求。本文首先设计了三种太赫兹石墨烯天线,最小尺寸为5微米,研究了其辐射效率和相位调控特性。进而提出了具有双共振模式的石墨烯-金属太赫兹超表面天线,缓解了传统的基于单共振模式的相位动态调控范围和辐射效率之间存在的矛盾,实现了0~360°内的动态相位调控,同时辐射效率高于60%。采用微加工工艺进行了样品加工,通过改变栅极电压,在实验上获得了1.03 THz的太赫兹动态相位调控,同时反射率高于23%,与仿真结果基本吻合。在此基础上,采用连续相位编码方案设计了石墨烯超表面相控阵天线,在理论上实现了太赫兹波束在-25°~25°范围的实时波束偏转。本文为解决超表面相控阵天线的相位动态调控范围小、辐射效率低等难题提供了新的研究思路。

    Abstract:

    Terahertz wave is defined as the far-infrared electromagnetic (EM) radiation between 0.1 and 10 THz. It has attracted increasing attention in both fundamental research and technological applications for its unique characteristics. In terahertz telecommunication, radar and imaging systems, terahertz antenna is key for the performance. To date, reported terahertz antennas suffer from limited phase modulation, relatively low efficiency and small beaming angle. Here we address these challenges by first designing three types of terahertz graphene antennas with the smallest size of 5 μm. We then propose a novel type of antenna with dual resonances, and achieve dynamic phase modulation within the full 2π range and meanwhile high efficiency above 20%. This performance surpasses antennas with single resonance since dual resonances alleviate the contradiction between large phase modulation range and high efficiency. We prepared terahertz graphene antennas with standard micro-fabrication processes, and experimentally obtained terahertz dynamic phase modulation of 1.03 THz with reflection efficiency above 23%, which agree with the simulation results. Making use of the phase modulation metasurfaces tuned according to continuous phase coding, we numerically realized terahertz beam steering with dynamic range of -25°~25°. We expect this work will provide a strategy for achieving large-range phase modulation and beam steering beyond the terahertz regime.

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罗小青,黄文礼,王彬旭,等.基于石墨烯超表面天线的太赫兹动态相位调控及波束扫描 [J].集成技术,

Citing format
Luo Xiao Qing, Huang Wen Li, Wang Bin Xu, et al. Terahertz graphene antennas for dynamic phase modulation and beam steering[J]. Journal of Integration Technology.

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  • 收稿日期:2022-11-22
  • 最后修改日期:2023-01-11
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  • 在线发布日期: 2023-06-06
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