Multidimensional imaging techniques using Metasurface modulators

成像是一项重要的技术，由塑造我们现代世界的众多设备实现。在电磁频谱的太赫兹范围内，成像由于其用于非破坏性评估、生物和化学危害检测以及人员筛查的潜力而非常需要。 虽然大量的努力不断努力实现太赫兹检测器阵列，从其中时尚的相机，太赫兹范围内的成像是非常困难的，并最终限制由于低源功率和检测器灵敏度。然而，可以使用超材料空间光调制器（SLM）来构造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。将开发和应用新的计算成像技术，以获取多维图像，包括超光谱、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，将允许实验室的成员积极促进新兴领域的元表面太赫兹传感和通信和先进的成像技术。拟议的研究计划的目标是空间光调制器和计算成像技术的发展，以实现在太赫兹频率制度的多维成像。该项目利用超颖表面工程亚波长金属结构的最新发展，能够实现异国情调的电磁响应。这项工作已被组织成三个重点，重点是提供显着的收益：（一）并行编码孔径成像，（二）子奈奎斯特采样，（三）先进的调制方案，多维采集。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被合并到一个单一的系统中，以提高整体性能和/或功能。每个研究重点的一般技术方法都从概念和计算设计和分析开始。在第二步中，PI和他的学生将采用各种制造方法来实现所需的设计。接下来，他们将表征制造的材料并设置所提出的各种成像系统。最后，PI和他的学生将分析测量的结果，以用于后续的迭代和项目目标的优化。

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.