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ISSN: 1023-5086

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ISSN: 1023-5086

Scientific and technical

Opticheskii Zhurnal

A full-text English translation of the journal is published by Optica Publishing Group under the title “Journal of Optical Technology”

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DOI: 10.17586/1023-5086-2025-92-10-16-25

УДК: 535.417.22, 544.25

Spectral shift of microresonator modes with a photo-controlled cholesteric defect layer

Krakhalev, M.N., Abdullaev A.S., Zuev A.S., Gunyakov V.A., Timofeev, I.V., Zyryanov, V.Y.

Full text on elibrary.ru

For Russian citation (Opticheskii Zhurnal):

Крахалев М.Н., Абдуллаев А.С., Зуев А.С., Гуняков В.А., Тимофеев И.В., Зырянов В.Я. Спектральный сдвиг мод микрорезонатора с фотоуправляемым холестерическим дефектным слоем // Оптический журнал. 2025. Т. 92. № 10. С. 16–25. http://doi.org/10.17586/1023-5086-2025-92-10-16-25

Krakhalev M.N., Abdullaev A.S., Zuev A.S., Gunyakov V.A., Timofeev I.V., Zyryanov V.Ya. Spectral shift of microresonator modes with a photo-controlled cholesteric defect layer [in Russian] // Opticheskii Zhurnal. 2025. V. 92. № 10. P. 16–25. http://doi.org/10.17586/1023-5086-2025-92-10-16-25

For citation (Journal of Optical Technology):
-
Abstract:

Subject of research. Fabry–Perot microresonators with a photosensitive cholesteric as a defect layer are investigated. The pitch of the cholesteric helix is changed by ultraviolet or blue light. Planar-tangential boundary conditions are set for the cholesteric, thus enabling the continuous variation in the twist angle of the structure. Purpose of the work is to establish the patterns of the change in polarization and spectral characteristics of microresonator modes on the twist angle of the planar cholesteric structure. Methods. The microresonators are investigated experimentally and by numerical simulations using the Berreman matrix method generalized for the case of anisotropic medium. Studies are performed for the microresonator cavity thicknesses of 3.63 µm and 7.68 µm. Main results. It is shown that the re- and ro-modes of the microresonator are controlled with the same efficiency by changing the twist angle of the cholesteric. As the twist angle is increased, the re-modes shift to a red range of the spectrum, while the ro-modes exhibit a blue spectral shift. The magnitude of the spectral shift of modes is limited by the phenomenon of anticrossing of modes of neighboring series appearing in the Gooch–Tarry maximum, where the mode type changes from re- to ro- and vice versa. The position of the Gooch–Tarry maximum exhibits a red spectral shift at an increasing of cholesteric twist angle, the rate of the spectral shift rises with reducing the liquid crystal layer thickness and increasing light wavelength. Practical significance. The obtained results can be promising for the development of photo-controlled photonic systems with improved optical characteristics.

Keywords:

Fabry–Perot cavity, cholesteric, photocontrol, twisting of orientational structure, light polarization

Acknowledgements:
this research was funded by Russian Science Foundation, Grant № 24-12-00236, https://rscf.ru/en/project/24-12-00236/

OCIS codes: 230.5750, 160.3710, 160.5335

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