Abstract: A device for determining coplanarity of two surfaces includes an illumination system for providing first light to a first surface and providing second light to a second surface. The first surface redirects at least a portion of the first light and the second surface redirects at light a portion of the second light. The device also includes an optical detector positioned to receive an overlap of the redirected portion of the first light and the redirected portion of the second light. An image of the overlap of the redirected portion of the first light and the redirected portion of the second light indicates coplanarity of the first surface and the second surface.

Abstract: In some examples, a device may include a backlight unit configured to illuminate a display. In some examples, a light source may direct light into an active photonic circuit. The active photonic circuit may include optical switches controllable to distribute the light to illuminate display zones. An active photonic circuit may include an arrangement of optical switches configured to allow particular zones to be raster scanned, for example, using light distribution and outcoupling further using a passive photonic circuit. The illumination intensity for each zone may be controlled using the optical switches and/or with variation of the light source intensity. In some examples, the illumination intensity for each zone can be varied based on the displayed content, allowing improved contrast ratios. In some examples, all zones may be illuminated simultaneously with a zonal illumination intensity based on displayed content. Other devices, methods, systems, and computer-readable media are also disclosed.

Abstract: The disclosure provides high refractive index ceramic material nanoimprint lithography (NIL) gratings having a relatively lower amount of carbon compared to traditional NIL gratings, and methods of making and using thereof, and devices including such gratings. The ceramic material includes one or more of titanium oxide, zirconium oxide, hafnium oxide, tungsten oxide, zinc tellurium, gallium phosphide, or any combination or derivative thereof.

Abstract: The disclosure provides high refractive index ceramic material nanoimprint lithography (NIL) gratings having a relatively lower amount of carbon compared to traditional NIL gratings, and methods of making and using thereof, and devices including such gratings. The ceramic material includes one or more of titanium oxide, zirconium oxide, hafnium oxide, tungsten oxide, zinc tellurium, gallium phosphide, or any combination or derivative thereof.