Light field image sensor, method and applications
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United States of America Patent
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Sep 10, 2013
Grant Date -
Jul 21, 2011
app pub date -
Jul 24, 2009
filing date -
Jul 25, 2008
priority date (Note) -
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Abstract
An angle-sensitive pixel (ASP) device that uses the Talbot effect to detect the local intensity and incident angle of light includes two local diffraction gratings stacked above a photodiode. When illuminated by a plane wave, the upper grating generates a self-image at a selected 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. Arrays of such structures are sufficient to localize light sources in three dimensions without any additional optics.
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