Vacuum Bragg grating and method of manufacture

Improvements for gratings in waveguides and methods of producing gratings are described herein. A deep surface relief grating (SRG) can provide a number of advantages compared to conventional SRG and Bragg gratings, one important advantage being a higher S diffraction efficiency. In one embodiment, the deep SRG may be implemented as a polymer surface relief grating or a vacuum Bragg grating (EBG). The EBG may be formed by first recording a holographic polymer dispersed liquid crystal (HPDLC) grating. Removal of liquid crystal from the cured grating provides a polymer surface relief grating. Polymeric surface relief gratings have a number of applications, including use in waveguide-based displays. 本文中描述了用于波导中的光栅和产生光栅的方法的改进。与常规SRG和布拉格(Bragg)光栅相比，深表面起伏光栅(SRG)可提供许多优点，重要的一个优点为较高的S衍射效率。在一个实施例中，深SRG可实施为聚合物表面起伏光栅或真空布拉格光栅(EBG)。可通过首先记录全息聚合物分散液晶(HPDLC)光栅来形成EBG。从经固化光栅去除液晶提供聚合物表面起伏光栅。聚合物表面起伏光栅具有许多应用，包括用于基于波导的显示器中。