基于时域数字编码超材料的非线性准贝塞尔波束生成

方祖琦; 程强; 崔铁军

doi:10.12000/JR21043

Nonlinear Quasi-Bessel Beam Generation Based on the Time-domain Digital-Coding Metasurface

DOI: 10.12000/JR21043

State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 211189, China

Funds: The National Key Research and Development Program of China (2017YFA0700201), The National Natural Science Foundation of China (61890544)

More Information

Author Bio:
FANG Zuqi (1995–) is a doctoral candidate at Southeast University. His main research interests are passive phased arr ays, smart antennas and metamaterials. E-mail: 230209030@seu.edu.cn

CHENG Qiang (1979–) received the B.S. and M.S. degrees from the Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 2001 and 2004, respectively, and the Ph.D. degree from Southeast University, Nanjing, in 2008. In 2008, he joined the State Key Laboratory of Millimeter Waves, Southeast University, where he was involved in the development of metamaterials and metadevices. He is currently a Full Professor with the School of Information Science and Engineering, Southeast University. He leads a group of Ph.D. students and master’s students in the areas of metamaterials, tunable microwaves circuits, microwave imaging, and terahertz systems. He has authored or coauthored more than 100 publications, with citation over 2000 times. E-mail: qiangcheng@seu.edu.cn

CUI Tiejun (1965–) is the academician of Chinese Academy of Sciences and the Chief Professor of Southeast University, Nanjing, China. He authored or co-authored two books and published over 500 peer-review journal papers, which have been cited by more than 35000 times (H-index 93, Google Scholar). He proposed the concepts of digital coding metamaterials, programmable metamaterials, and information metamaterials, and realized their first demonstrations. Dr. Cui received the National Natural Science Awards of China in 2014 and 2018, respectively. Based on Clarivate Analytics, he was a Highly Cited Researcher (Web of Science) in 2019 and 2020, and his researches have been widely reported by Nature News, Science, MIT Technology Review, Scientific American, New Scientists, etc. Dr. Cui is an IEEE Fellow. E-mail: tjcui@seu.edu.cn

Corresponding author: CUI Tiejun. E-mail: tjcui@seu.edu.cn

摘要

摘要: 准贝塞尔光束是一种广泛应用于微波和光学领域中的非衍射波束。虽然有许多生成准贝塞尔波束的方法被提出，但它们只应用于线性系统中，因此非线性准贝塞尔波束的生成仍然是一个重大的挑战。为此，作者提出了一种基于时域数字编码超表面的高次谐波上的准贝塞尔光束产生方法，通过适当的编码方案实现对非线性频率分量上的超表面相位分布的精确控制，并详细分析了相位离散化对贝塞尔波束形成造成的影响。仿真结果验证了该方法的有效性，并为非线性波束生成提供了一条新的路径。
- 时域数字编码超材料 /
- 贝塞尔波束 /
- 非线性调制
Abstract: A quasi-Bessel beam is a type of nondiffracted beam commonly used in microwave and optical fields. Although numerous methods have been proposed for quasi-Bessel beam generation, they are valid only in linear systems, indicating that the generation of nonlinear quasi-Bessel beams remains a major challenge. Thus, we propose a new approach to produce quasi-Bessel beams at high-order harmonics based on the time-domain digital-coding metasurface, which is utilized to achieve accurate control of the phase profile at the nonlinear frequencies via proper coding strategies. The effect of phase discretization is also analyzed in detail. The simulation results confirm the validity of the proposed method, which provides a new approach for nonlinear beam manipulation.
- Time-domain digital coding metasurface /
- Bessel beam /
- Nonlinear modulation

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Figure 1. Schematic of the nonlinear Quasi-Bessel beam generation based on the metasurface

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Figure 2. Phase distribution of the metasurface in order to get a nonlinear zeroth-order Quasi-Bessel beam

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Figure 3. Dependence of the metasurface reflectivity on normalized time (a) and generation of the first order harmonic at the incidence of the monochromatic wave with the carrier frequency of f₀ (b)

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Figure 4. Dependence of the first harmonic phase on the delay time (Time delay quantization effects are taken into account)

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Figure 5. The relative amplitudes of the higher-order harmonics due to the time delay quantization

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Figure 6. Continuous harmonic phase distribution (a) and discrete harmonic phase distribution (b) of the metasurface

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Figure 7. Simulated electric field distributions of the first order harmonic Quasi-Bessel beam at a cutplane perpendicular to the metasurface, when the phase profile of the metasurface

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Figure 8. The simulated first order harmonic electric field distributions at a cutplane parallel to the metasurface

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