Light field image sensors based on the Talbot effect.
Light field image sensors based on the Talbot effect.
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DOI：
10.1364/ao.48.005897
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发表时间：
2009-11-01
期刊：
影响因子：
1.9
通讯作者：
Molnar A
中科院分区：
文献类型：
--
作者：
Wang A;Gill P;Molnar A
我们提出了一个像素级传感器，利用塔尔博特效应来检测本地强度和入射角的光。该传感器包括两个局部衍射光栅堆叠在光电二极管上方。当被平面波照射时，上光栅在半个塔尔博特深度处产生自像。放置在该深度处的第二光栅根据入射角阻挡或通过光。几个这样的结构，调谐到不同的入射角，足以提取局部入射角和强度。此外，这种结构的阵列足以在三维中定位光源，而无需任何额外的光学器件。
We present a pixel-scale sensor that uses the Talbot effect to detect the local intensity and incident angle of light. The sensor comprises two local diffraction gratings stacked above a photodiode. When illuminated by a plane wave, the upper grating generates a self-image at the half Talbot depth. The second grating, placed at this depth, blocks or passes light depending upon incident angle. Several such structures, tuned to different incident angles, are sufficient to extract local incident angle and intensity. Furthermore, arrays of such structures are sufficient to localize light sources in three dimensions without any additional optics.