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.
展开▼
机译：偏振体光栅（PVG）包括块状双折射介质，其特征是具有多个具有螺旋轴和周期性Λ y 的螺旋结构，以及具有可旋转光轴的各向异性取向材料，该各向异性取向材料设置在顶部或介质的底面。 PVG的特征在于，取向材料的光轴在材料表面的平面中具有连续旋转的光轴取向，并且具有周期性Λ x ，其中螺旋轴垂直于光轴。在取向材料表面中，还包括双折射介质，其特征在于，多个可控倾斜的折射率平面具有倾斜角φ=±arctan（Λ y /Λ x ）和布拉格期间Λ B 。公开了制造方法。
展开▼
