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...

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Bibliographic Details
Published inKompʹûternaâ optika Vol. 47; no. 3; pp. 341 - 349
Main Authors Bykov, D.A., Bezus, E.A., Doskolovich, L.L.
Format Journal Article
LanguageEnglish
Published Samara National Research University 01.06.2023
Subjects
coupled-mode theory
grating
linearly varying filter
resonance
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Summary: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.
ISSN:0134-2452
2412-6179
DOI:10.18287/2412-6179-CO-1232