Micro-actuated adaptive diffractive composites
AssigneeMassachusetts Institute of Technology
InventorsGeorge Barbastathis, Sang-Gook Kim, Wei-Chuan Shih, Chee Wei Wong, Yong-Bae Jeon
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Abstract
A volume diffractive composite is disclosed for providing illumination at a first output angle. The volume diffractive composite comprises a first plurality of grating elements that are mutually spaced from another in a first position with a first spacing period along a first plane, and an actuation unit for changing at least one of the position or the spacing period of the first plurality of grating elements to a second position or spacing period to provide illumination at a second output angle.
Claims33
A volume diffractive composite for providing illumination at a first output angle, said volume diffractive composite comprising:
- a first plurality of grating elements that are mutually spaced from another in a first position with a first spacing period along a first plane;
- a second plurality of grating elements that are mutually spaced from another in a second position with a second spacing period that is different than the first spacing period along a second plane;
- first actuation means for changing at least one of the position or the spacing period of said first plurality of grating elements to a third position or spacing period;
- and
- second actuation means for changing at least one of the position or spacing period of said second plurality of grating elements to a fourth position or spacing period independent of said first position and spacing period and said third position and spacing period.
A volume diffractive composite comprising:
- a first plurality of grating elements that are mutually spaced from another in a first position;
- a second plurality of grating elements that are mutually spaced from another in a second position;
- first actuation means for changing at least one of the position or a spacing period of said first plurality of grating elements independent of said second position or a spacing period of said second plurality of said grating elements;
- and
- second actuation means for changing the spacing period of said second plurality of grating elements to a fourth spacing period independent of said first spacing period of said first plurality of said grating elements.
A diffractive composite comprising:
- a first plurality of grating elements formed by patterned deposition through a mask, said first plurality of grating elements being mutually spaced from another in a first position;
- a second plurality of grating elements formed by pattern deposition through a mask, said second plurality of grating elements being mutually spaced from another in a second position;
- first actuation means for changing at least one of the position or a spacing period of said first plurality of grating elements;
- and
- second actuation means for changing at least one of the position or a spacing period of said second plurality of grating elements independent of said first plurality of grating elements.
A volume diffractive composite for providing illumination at first output angle, said volume diffractive composite comprising:
- a first plurality of grating elements that are mutually spaced from another in a first position with a first spacing period along a first plane;
- a second plurality of grating elements that are mutually spaced from another in a second position with a second spacing period along a second plane;
- first actuation means for changing the spacing period of said first plurality of grating elements to a spacing period;
- and
- second actuation means for changing the spacing period of said second plurality of grating elements to a fourth spacing period independent of said first spacing period and said third spacing period.
Dependencies are inferred from the claim text.