18 November 2013 Grating optical filter for pre-adapted angular selective regulation of directional light transmission
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Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 87851P (2013) https://doi.org/10.1117/12.2019117
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal
Abstract
Classical multilayer filters are optically homogeneous in each layer of the surface coatings. Diffraction gratings and photonic crystals used in the filters have micro- and nanoscale inhomogeneities. An optical filter consisting of sheet transparent substrate with thin-film grating layers on both surfaces is developed. Macroscopic gratings of submillimeter widths are formed by directionally transmissive strips, alternating with absorptive, reflective, or scattering strips. Their relative position on input and output surfaces provides angular selectivity of light transmission – part of the radiation that has passed through input gratings is blocked additionally by output gratings depending on incidence angle. Graphicanalytical calculation method determines the influence of optical and geometric parameters of alternating strips on angular characteristics of transmission. Characteristics are broken lines with areas of decreasing or increasing transmission, which practically linear for the angles up to approximately 60°, with further increase in the angles, the lines are curved more because of sinusoidal dependence under Snell's law. Results of graphic-analytical calculations are confirmed experimentally. Preset the desired dependence of transmission is adjusted considering reflection (Fresnel formulas) and absorption (Bouguer-Lambert law). The adjusted dependence is approximated to a broken line taking into account obtained regularities. Finally, all parameters of alternating strips of gratings are chosen. Thus at pre-known trajectory of light source relative to the filter pre-adapted angular selective regulation of its light transmission is provided. Architectural glazing to control the transmitted solar radiation without special redirecting devices and provide invisibility through window at predetermined angles is the most promising area of application.
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Rustam S. Zakirullin, Rustam S. Zakirullin, } "Grating optical filter for pre-adapted angular selective regulation of directional light transmission", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 87851P (18 November 2013); doi: 10.1117/12.2019117; https://doi.org/10.1117/12.2019117
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