Light Modulator for Representing Complex-Valued Data
First Claim
1. Light modulator for representing complex-valued information, comprising an encoding surface and a certain structured retardation layer, where the encoding surface comprises an arrangement of pixels, whose transmissive or reflective phase shift can be controlled, where for encoding individual components of a complex number at least one given pixel of a pixel group of adjacent pixels of the encoding surface is assigned with the certain structured retardation layer, which causes an angle-specific change in the optical path length of an incident bundle of rays having linear polarisation, wherein the layer thickness of the retardation layer is dimensioned such that when encoding the individual components of a complex number the change in the optical path length through the retardation layer counteracts the angle-specific change in the retardation among individual pixels of the pixel group, and compensates the angle-specific change in the retardation at least partly or even entirely.
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Abstract
A light modulator is disclosed for representing complex-valued data, comprising an encoding area that has an arrangement of pixels, the phase of which can be controlled. This largely avoids an interfering optical path difference between adjacent pixels or pixel groups when a complex value is encoded in several adjacent phase pixels of the encoding area, the optical path difference varying according to the angle. One respective specific structured delaying layer, which causes the optical path of an incident linearly polarized beam to change according to the angle, is associated with at least one predefined pixel of a group of adjacent pixels of the encoding area. The thickness of the delaying layer is designed such that the modification of the optical path caused by the delaying layer runs in the opposite direction from the angle-related modification of the optical path difference between individual pixels of the pixel group.
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Citations
28 Claims
- 1. Light modulator for representing complex-valued information, comprising an encoding surface and a certain structured retardation layer, where the encoding surface comprises an arrangement of pixels, whose transmissive or reflective phase shift can be controlled, where for encoding individual components of a complex number at least one given pixel of a pixel group of adjacent pixels of the encoding surface is assigned with the certain structured retardation layer, which causes an angle-specific change in the optical path length of an incident bundle of rays having linear polarisation, wherein the layer thickness of the retardation layer is dimensioned such that when encoding the individual components of a complex number the change in the optical path length through the retardation layer counteracts the angle-specific change in the retardation among individual pixels of the pixel group, and compensates the angle-specific change in the retardation at least partly or even entirely.
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7. (canceled)
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9-11. -11. (canceled)
Specification