Ultrafast light field tomography
SCIEN Colloquium and EE 292E
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Talk Abstract: Cameras with extreme speeds are enabling technologies in both fundamental and applied sciences. However, existing ultrafast cameras are incapable of coping with extended three-dimensional (3D) scenes. To address this unmet need, we developed a new category of computational ultrafast imaging technique, light field tomography (LIFT), which can perform 3D snapshot transient (time-resolved) imaging at an unprecedented frame rate with full-fledged light field imaging capabilities including depth retrieval, post-capture refocusing, and extended depth of field. As a niche application, we demonstrated real-time non-line-of-sight imaging of fast-moving hidden objects, which is previously impossible without the presented technique. Moreover, we showcased 3D imaging of fiber-guided light propagation along a twisted path and the capability of resolving extended 3D objects. The advantage of such recordings is that even visually simple systems can be scientifically interesting when they are captured at such a high speed and in 3D. The ability to film the propagation of light through a curved optical path, for example, could inform the design of invisibility cloaks and other optical metamaterials.
Speaker Biography: Dr. Liang Gao is currently an Assistant Professor of Bioengineering at UCLA. His primary research interests encompass multidimensional optical imaging, including hyperspectral imaging and ultrafast imaging. Dr. Liang Gao is the author of more than 70 peer-reviewed publications in top-tier journals, such as Nature, Nature Communications, Science Advances, and PNAS. He received his BS degree in Physics from Tsinghua University in 2005 and Ph.D. degree in Applied Physics and Bioengineering from Rice University in 2011.