Methods of forming optical combiners

Abstract

A method of forming an optical combiner having a light guide and an in-coupler disposed therein includes: selecting an optical combiner parameter set including a grating period of the in-coupler, a thickness-to-width ratio of the optical combiner, a refractive index of the light guide, and a field of view of the optical combiner; calculating a total in-coupling efficiency of the optical combiner as a function of an angle of incidence of an incident light comprising a wavelength within the field of view of the optical combiner; and configuring the optical combiner parameter set to maximize a relative in-coupling efficiency of the optical combiner, defined as a minimum field efficiency normalized by a theoretical efficiency maximum of the optical combiner.

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