基于新型电磁功能器件的太赫兹高效波束调控机理与成像方法研究

The methods of beam modulation with high efficiency have valuable applications in terahertz imaging, radar and communication, and are expected to play important roles both in military and civil applications. In this project, the theory for phase and beam modulation of terahertz waves with novel materials and devices will be studied.The mechanism and design methods for terahertz functional devices will be explored, to achieve frequency-controlled beam steering with wide angle spectrum, and to achieve electronically-controlled beam steering in terahertz band. Practical and feasible models will be proposed for the novel devices, and then they will be developed, characterized and optimized. Based on the fabricated devices, a new concept for terahertz three-dimensional imaging with high frame rate will be proposed. The corresponding imaging theorem, scheme and methods on experiments will be investigated in detail, including the synthesized aperture focusing theory based on virtual phase center scanning, the multiple frequency synthesis method for terahertz return wave analysis, the correction method of the nonlinear beam scanning, and so on, to realize terahertz imaging reconstruction with large depth of focus and high frame rate. Experimental demonstration on the three-dimensional imaging with high frame rate will finally be performed, to verify the function of novel devices, the effectiveness of imaging scheme and the reconstruction algorithms in systematic level. Based on this project, a series of comprehensive and innovative research outcomes are expected to be achieved which covering wide aspects upon materials, devices and system methodologies in terahertz band, and can be extended for the applications in terahertz radar, communication and missile guidance, and may greatly contribute to the developments of terahertz science and technology.

高效率的波束调控方法在太赫兹成像、太赫兹雷达与通信等领域具有重要应用价值，在军事和民用上都具重要意义。本项目研究新型电磁材料与器件对太赫兹波相位和波束的调控机理，探索具有宽角谱频控波束扫描和高效率电控波束扫描特性的新型太赫兹功能器件的理论与设计方法，提出可行的工程应用模型，开展并完成原理器件研制、性能表征与优化等工作。并以此为契机提出基于太赫兹波束调控器件的三维高帧率成像新方法，开展成像理论、成像性能仿真评估及实验方案研究，探索虚拟相位中心合成孔径成像机理、太赫兹多频回波合成方法、波束扫描非线性校正方法等新机理与新方法，实现太赫兹高帧率大景深图像重建。在此基础上开展太赫兹三维高帧率成像的原理实验研究，对新型功能器件、新型成像体制和成像算法进行系统级验证，形成贯穿太赫兹材料、器件与系统方法的综合创新成果，深入研究成果还可推广应用于太赫兹雷达、通信、制导等领域，促进太赫兹科学与工程技术的发展。

高效率的波束调控方法在太赫兹成像、太赫兹雷达与通信等领域具有重要应用价值，在军事和民用上都具重要意义。本项目研究了新型电磁材料与器件对太赫兹波相位和波束的调控机理，提出了太赫兹频控波束扫描器件的衍射波模式竞争模型，以及基于复合子单元相干衍射增强的设计原理，建立了具有宽角谱频控波束扫描特性的太赫兹新型功能器件的优化设计方法，在太赫兹频段完成了频控波束扫描器件的研制；研究了加载液晶材料的高效电控波束扫描器件的机理与设计方法，建立了可行的工程应用模型，完成了原理器件的研制。设计开发了用于太赫兹波束调控器件性能测试的太赫兹近场扫描测量装置，完成了新型电磁功能器件的测试表征。在此基础上提出基于太赫兹波束调控器件的成像新方法，开展了成像原理试验和高效图像重建方法研究。通过本项目研究，形成贯穿太赫兹材料、器件与系统方法的综合创新成果，目前已发表SCI收录学术论文14篇，申请发明专利7项，形成了一系列原理器件和原理试验系统。本项目的深入研究成果还可推广应用于太赫兹雷达、通信、制导等领域，促进太赫兹科学与工程技术的发展。