VOLUME POLARIZATION GRATING, METHODS OF MAKING, AND APPLICATIONS
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United States of America Patent
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Jun 23, 2017
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Jun 27, 2016
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A polarization volume grating (PVG) includes a bulk, birefringent medium characterized by a plurality of helical structures with helix axes and a periodicity Λy and an anisotropic alignment material having a rotatable optical axis, disposed on a top or bottom surface of the medium. The PVG is characterized in that the optical axis of the alignment material has a continuously rotated optical axis orientation in a plane of the material surface and a periodicity Λx, wherein the helix axes are normal to the optical axes in the alignment material surface, further wherein the birefringent medium is characterized by a plurality of controllably slanted refractive index planes having a slant angle φ=±arctan (Λy/Λx) and a Bragg period ΛB. Fabrication methods are disclosed.
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