Multidimensional imaging techniques using Metasurface modulators

成像是一项必不可少的技术，许多设备都塑造了我们的现代世界。在太赫兹电磁波谱范围内，由于成像具有非破坏性评估、生物和化学危害检测以及人员筛选的潜力，因此非常需要成像。尽管不断地努力实现太赫兹探测器阵列，从太赫兹到时尚相机，太赫兹范围内的成像是极其困难的，最终由于低源功率和探测器灵敏度而受到限制。然而，使用超材料空间光调制器（slm）可以构建一种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，以实现包括高光谱、偏振和三维信息在内的多维图像的捕获。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，将允许实验室成员积极地为太赫兹传感、通信和先进成像技术的新兴超表面领域做出贡献。该研究计划的目标是发展空间光调制器和计算成像技术，以实现太赫兹频率下的多维成像。该项目利用了超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。这项工作分为三个重点，重点是在以下方面取得重大进展：(i)并行编码孔径成像，（ii）亚奈奎斯特采样，以及（iii）多维采集的高级调制方案。所有这三种努力都是协同和交叉的，开发的技术和算法将合并到一个系统中，以提高整体性能和/或功能。每个研究重点的一般技术方法从概念和计算设计和分析开始。在第二步，PI和他的学生将从事各种制造方法来实现期望的设计。接下来，他们将表征所制备的材料并设置所提出的各种成像系统。最后，项目负责人和他的学生将分析测量结果，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.