Abstract: An example apparatus may include a light source for illuminating a sample, an objective lens positioned on a light path extending from the sample, a lenslet array having a plurality of lenslets and positioned along the light path to receive light from the objective lens. The lenslet array may be positioned along the light path at substantially a Fourier plane of the sample. The example apparatus may also include a detector positioned along the light path approximately one lenslet focal length from the lenslet array. The plurality of lenslets of the lenslet array may correspond to portions of the detector. Each lenslet of the lenslet array may transmit to a corresponding portion of the detector an image of the same portion of the sample from a different viewing angle.

Abstract: A directional grating-based backlight includes a light guide to guide light and three sets of diffraction gratings. The diffraction grating sets are to selectively couple out portions of light to be guided by the light guide. The light is to propagate within the light guide in three different propagation directions separated in angle by about 120 degrees. The sets of diffraction gratings are to couple out different portions of the guided light as substantially collimated light using diffraction coupling. The substantially collimated light is to be emitted from the directional grating-based backlight in substantially the same direction.