Abstract
A simple method for designing and calculating grating optical filters with angular-selective light transmission is presented. The selectivity is provided by the relative positions of two surface gratings formed by directionally transmissive strips, alternating with absorptive, reflective, or scattering strips. As the incidence angle changes, the proportion of radiation that passes through both gratings also changes. Geometric and optical filter parameters are calculated to achieve a light transmittance with a predetermined angular dependence. This method can be used to create neutral-density, frequency, and spatial filters pre-adapted to incidence angles that change when the light source moves relative to the filter.
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