A grating optical filter for a smart window is presented, which provides dynamic control of the daylight and solar energy indoors throughout the year without human intervention and without the use of daylight-redirecting devices. Thin-layer gratings of alternating directionally transmissive and nontransmissive parallel bands on both surfaces of a window are arranged at an angle to the horizontal, taking into account the Sun's trajectory relative to the window. The methods for calculating the optimal geometric parameters and angular characteristics of the filter for minimizing the light transmission for a specific date and time of day at a given latitude and longitude of the building and the azimuth of the window are described. A numerical simulation of the light transmission is performed, and the results are confirmed experimentally. (C) 2019 Optical Society of America
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