Теория связанных мод для резонансных дифракционных решёток с изменяющимся периодом
Автор: Быков Дмитрий Александрович, Безус Евгений Анатольевич, Досколович Леонид Леонидович
Журнал: Компьютерная оптика @computer-optics
Рубрика: Дифракционная оптика, оптические технологии
Статья в выпуске: 3 т.47, 2023 года.
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В работе предложена теория связанных мод для резонансных дифракционных решеток с изменяющимся периодом. Рассмотрены дифракционные структуры, у которых вектор обратной решетки - величина, обратно пропорциональная периоду, - линейно изменяется в направлении периодичности. Показано, что оптические свойства такой структуры существенным образом зависят от скорости изменения периода. На основе сравнения с результатами строгого численного моделирования в рамках метода фурье-мод показана высокая точность предложенной теоретической модели. В частности, разработанная теория связанных мод описывает уширение резонансного пика и появление вторичных максимумов, вызванные ненулевой скоростью изменения периода. Полученные результаты могут найти применение при разработке линейно изменяющихся спектральных фильтров на основе резонансных дифракционных решеток с изменяющимися параметрами.
Резонанс, дифракционная решётка, линейно изменяющийся фильтр, теория связанных мод
Короткий адрес: https://sciup.org/140300055
IDR: 140300055 | DOI: 10.18287/2412-6179-CO-1232
Coupled-mode theory for resonant gratings with a varying period
We propose a coupled-mode theory for resonant diffraction gratings with a varying period. We consider diffractive structures, in which the reciprocal lattice vector, a quantity inversely proportional to the period, varies linearly in the direction of periodicity. It is shown that optical properties of such a structure essentially depend on the period change rate. On the basis of a comparison with the results of rigorous numerical simulations using the rigorous coupled-wave analysis, high accuracy of the proposed theoretical model is demonstrated. In particular, the developed coupled-mode theory describes the broadening of the resonant peak and the appearance of secondary maxima caused by a non-zero period change rate. The obtained results can be used for the development of linear variable filters based on resonant diffraction gratings with varying parameters.
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