Light field image sensor with an angle-sensitive pixel (ASP) device
First Claim
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1. An angle-sensitive pixel (ASP) device, comprising:
- a substrate; and
a plurality of nano-scale to micron-scale ASPs disposed in and on the substrate, wherein each ASP comprises;
a phase grating having a period, p1, further wherein the phase grating is characterized by a periodic variation of refractive index in a direction transverse to an incident light field and forms a periodic intensity pattern in a Talbot plane below the phase grating;
an amplitude transmission analyzer grating having a period, p2 disposed in the Talbot plane; and
a sensor disposed at a selected distance below the analyzer grating.
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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 a phase grating disposed above a photodiode assembly or a phase grating disposed above an analyzer grating that is disposed above a photodiode assembly. When illuminated by a plane wave, the upper grating generates a self-image at a selected Talbot depth. 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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Citations
15 Claims
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1. An angle-sensitive pixel (ASP) device, comprising:
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a substrate; and a plurality of nano-scale to micron-scale ASPs disposed in and on the substrate, wherein each ASP comprises; a phase grating having a period, p1, further wherein the phase grating is characterized by a periodic variation of refractive index in a direction transverse to an incident light field and forms a periodic intensity pattern in a Talbot plane below the phase grating; an amplitude transmission analyzer grating having a period, p2 disposed in the Talbot plane; and a sensor disposed at a selected distance below the analyzer grating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15)
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9. An angle-sensitive pixel (ASP) device, comprising:
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a substrate; and a plurality of ASPs disposed in and on the substrate, wherein each ASP comprises; a phase grating having a period, p1, further wherein the phase grating is characterized by a periodic variation of refractive index in a direction transverse to an incident light field and forms a periodic intensity pattern in a Talbot plane below the phase grating; and a sensor disposed in the Talbot plane, further wherein at least some of the plurality of the angle sensitive pixels have different orientations with respect to each other. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification