Multidimensional imaging techniques using Metasurface modulators

使用超表面调制器的多维成像技术

• 批准号: 1610342
• 负责人: Willie Padilla
• 金额: $ 30.08万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-01 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1610342&HistoricalAwards=false
• 关键词: Multidimensional; imaging; techniques; using; Metasurface

Imaging is an essential technology enabled by numerous devices that have shaped our modern world. In the terahertz range of the electromagnetic spectrum, imaging is highly desired due to its potential for non-destructive evaluation, bio and chemical hazard detection, and personnel screening. Although significant efforts continually strive to achieve arrays of terahertz detectors, from which to fashion cameras, imaging within the terahertz range is extremely difficult and ultimately restricted due to low source powers and detector sensitivity. However a different type of imaging system may be constructed using metamaterial spatial light modulators (SLMs), where only a single pixel is used to form the image, and may remove critical impediments toward making terahertz imaging a reality. Novel computational imaging techniques will be developed and applied to enable multidimensional images to be captured including hyperspectral, polarimetric and three-dimensional information. Beyond facilitating technological breakthroughs and exploring novel imaging techniques, the proposed project will establish a research training and teaching laboratory in the area of structured materials. The proposed research project is interdisciplinary and will permit members of the laboratory to actively contribute to the burgeoning field of metasurfaces for terahertz sensing and communications and advanced imaging techniques. The goal of the proposed research program is the development of spatial light modulators and computational imaging techniques to realize multidimensional imaging in the terahertz frequency regime. The project utilizes recent developments in metasurfaces engineered sub-wavelength metallic structures capable of achieving exotic electromagnetic response. The effort has been organized into three thrusts focused on providing significant gains in: (i) parallel coded aperture imaging, (ii) sub-Nyquist sampling, and (iii) advanced modulation schemes for multidimensional acquisition. All three efforts are synergistic and cross-cutting and the techniques and algorithms developed will be combined into a single system to enhance overall performance and/or functionality. The general technical approach for each of the research thrusts begins with conceptual and computation design and analysis. In step two the PI and his students will engage in various fabrication approaches to realize desired designs. Next they will characterize the fabricated materials and setup the various imaging systems proposed. Finally, the PI and his students will analyze the results of measurements for subsequent iteration and optimization of project goals.

成像是一项基本技术，许多设备塑造了我们的现代世界。在太赫兹电磁频谱范围内，成像因其在无损评估、生物和化学危险检测以及人员筛选方面的潜力而受到高度重视。虽然不断努力实现太赫兹探测器阵列，从阵列到时尚相机，但太赫兹范围内的成像是极其困难的，最终由于源功率和探测器灵敏度较低而受到限制。然而，可以使用超材料空间光调制器(SLM)来构建不同类型的成像系统，其中仅使用单个像素来形成图像，并且可以消除使太赫兹成像成为现实的关键障碍。新的计算成像技术将被开发和应用，以使多维图像能够被捕获，包括高光谱、偏振和三维信息。除了促进技术突破和探索新的成像技术外，拟议的项目还将在结构材料领域建立一个研究、培训和教学实验室。拟议的研究项目是跨学科的，将使实验室成员能够为太赫兹传感和通信以及先进成像技术的亚表面这一新兴领域作出积极贡献。提出的研究计划的目标是开发空间光调制器和计算成像技术，以实现太赫兹频率范围内的多维成像。该项目利用了亚表面工程亚波长金属结构的最新发展，能够实现奇异的电磁响应。这项工作分为三个阶段，重点是在：(I)并行编码孔径成像、(Ii)亚奈奎斯特采样和(Iii)用于多维采集的高级调制方案方面提供显著的收益。所有这三项工作都是协同和交叉的，所开发的技术和算法将合并到一个单一系统中，以提高整体性能和/或功能。每个研究项目的一般技术方法都是从概念和计算设计和分析开始的。在第二步中，PI和他的学生将从事各种制造方法来实现所需的设计。接下来，他们将对所制造的材料进行表征，并设置所建议的各种成像系统。最后，PI和他的学生将分析测量结果，以便后续迭代和优化项目目标。