CIF - Small: High Resolution Computational Imaging with Motion in Spatially Varying Fields

正在解决关于存在散射的光学信息的基本问题，更具体地说，涉及空间变化的电磁场中的物体运动。光通过光谱学提供关键信息，在人类健康应用中至关重要，并允许进行高分辨率成像。然而，例如，由于组织引起的随机光学散射可能会混淆感兴趣的对象。这种随机散射会产生散斑，这是激光指示器从粗糙表面散射时所看到的光的颗粒状性质。一种新的计算成像方法正在被开发，以基于这种结构场中的运动来成像隐藏的目标。通过对激光光照的控制和精确的运动，可以获得远亚波长的特征信息。这种理解正在发展成一种高分辨率的计算成像方法，在各种应用中至关重要。该项目的一个方面涉及使用物体位置上的光学散斑相关性或作为时间函数的光学散斑相关性，以潜在波长尺度分辨率通过或在强散射介质中成像。这个项目的目标是将这一概念的最初呈现带到一个实用的计算成像模式。具有代表几厘米组织的示例性散射介质的测量的激光散斑图像被用于对运动物体的不同程度的理解。另一个方向是开发一种计算方法，通过在由两束或多束激光建立的空间变化的场中精确扫描样本来确定是否存在小型物体。一个关键的应用是确定半导体材料系统中是否存在缺陷。更广泛地说，人们正在寻求基于结构照明中的运动的远亚波长光学成像的机会。

Basic questions about optical information in the presence of scatter, and more specifically, related to object motion in spatially varying electromagnetic fields, is being addressed. Light provides key information through spectroscopy, paramount in human health applications, and allows for high-resolution imaging. However, random optical scatter due to tissue, for example, can obfuscate an object of interest. Such random scatter produces speckle, the granular nature of light seen when a laser pointer scatters from a rough surface. A new computational imaging method is being developed to image hidden objects based on motion in such structured fields. With control over laser illumination and precise motion, far-subwavelength feature information can be obtained. This understanding is being developed into a high resolution computational imaging approach, critical in a variety of applications.One aspect of this project involves the use of optical speckle correlations over object position or as a function of time for imaging through or within a heavily scattering medium at potentially wavelength scale resolution. The goal of this project is to take the initial presentation of this concept to a practical computational imaging modality. Measured laser speckle images with example scattering media, representative of several centimeters of tissue, are being used with various levels of understanding about the moving objects. The other direction is to develop a computational method to determine if a small object is present by precisely scanning a sample in a spatially varying field established by two or more laser beams. A key application is to determine whether a defect exists in a semiconductor material system. More generally, opportunities for far-subwavelength optical imaging based on motion in structured illumination is being pursued.