Optical Waveguide Grating
Gratings are formed in several areas on the surfaces of parallel plates. These are diffraction gratings: after light is coupled into the plate through a grating, it propagates internally by total internal reflection and is diffracted out at the outcoupling grating, redirecting and transmitting light to deliver the image to the human eye. Etched gratings; etched slanted gratings; silicon wet-etched slanted gratings.
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