Light-Induced Higher-Order Bragg Resonance in Heliconical Cholesteric Liquid Crystals
Higher-order reflections from a cholesteric liquid crystal have been investigated for a long time after early observations of an oblique incidence of light. Even with the restriction of the required oblique geometry, wavelength tuning would make this property very attractive for photonic application...
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MDPI AG
2025-05-01
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| Online Access: | https://www.mdpi.com/2073-4352/15/6/513 |
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| author | Ashot H. Gevorgyan Francesco Simoni |
| author_facet | Ashot H. Gevorgyan Francesco Simoni |
| author_sort | Ashot H. Gevorgyan |
| collection | DOAJ |
| description | Higher-order reflections from a cholesteric liquid crystal have been investigated for a long time after early observations of an oblique incidence of light. Even with the restriction of the required oblique geometry, wavelength tuning would make this property very attractive for photonic applications in the near-UV range of the electromagnetic spectrum. Unfortunately, this is quite difficult to achieve in cholesterics, and it has been obtained in special configurations that lead to the deformation of the helical structure. We show here that a new opportunity is provided by heliconical cholesteric liquid crystals and demonstrate that second-order Bragg resonance with high reflectivity and a narrow band can be produced by a light beam with intensity high enough to give rise to a significant optical torque with the consequent distortion of the helical structure. Exploiting the well-known properties of heliconical cholesterics under electric fields, we also demonstrate that the easy tuning of the second-order reflection band is achieved in the near-UV range. |
| format | Article |
| id | doaj-art-ca454075d7a440c79d2db3e7814e6ff5 |
| institution | OA Journals |
| issn | 2073-4352 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj-art-ca454075d7a440c79d2db3e7814e6ff52025-08-20T02:24:38ZengMDPI AGCrystals2073-43522025-05-0115651310.3390/cryst15060513Light-Induced Higher-Order Bragg Resonance in Heliconical Cholesteric Liquid CrystalsAshot H. Gevorgyan0Francesco Simoni1School of Natural Sciences, Far Eastern Federal University, 10 Ajax Bay, Russky Island, 690922 Vladivostok, RussiaUniversità Politecnica delle Marche, 60131 Ancona, ItalyHigher-order reflections from a cholesteric liquid crystal have been investigated for a long time after early observations of an oblique incidence of light. Even with the restriction of the required oblique geometry, wavelength tuning would make this property very attractive for photonic applications in the near-UV range of the electromagnetic spectrum. Unfortunately, this is quite difficult to achieve in cholesterics, and it has been obtained in special configurations that lead to the deformation of the helical structure. We show here that a new opportunity is provided by heliconical cholesteric liquid crystals and demonstrate that second-order Bragg resonance with high reflectivity and a narrow band can be produced by a light beam with intensity high enough to give rise to a significant optical torque with the consequent distortion of the helical structure. Exploiting the well-known properties of heliconical cholesterics under electric fields, we also demonstrate that the easy tuning of the second-order reflection band is achieved in the near-UV range.https://www.mdpi.com/2073-4352/15/6/513higher-order Bragg resonanceheliconical liquid crystalsnonlinear opticspitch tuning |
| spellingShingle | Ashot H. Gevorgyan Francesco Simoni Light-Induced Higher-Order Bragg Resonance in Heliconical Cholesteric Liquid Crystals Crystals higher-order Bragg resonance heliconical liquid crystals nonlinear optics pitch tuning |
| title | Light-Induced Higher-Order Bragg Resonance in Heliconical Cholesteric Liquid Crystals |
| title_full | Light-Induced Higher-Order Bragg Resonance in Heliconical Cholesteric Liquid Crystals |
| title_fullStr | Light-Induced Higher-Order Bragg Resonance in Heliconical Cholesteric Liquid Crystals |
| title_full_unstemmed | Light-Induced Higher-Order Bragg Resonance in Heliconical Cholesteric Liquid Crystals |
| title_short | Light-Induced Higher-Order Bragg Resonance in Heliconical Cholesteric Liquid Crystals |
| title_sort | light induced higher order bragg resonance in heliconical cholesteric liquid crystals |
| topic | higher-order Bragg resonance heliconical liquid crystals nonlinear optics pitch tuning |
| url | https://www.mdpi.com/2073-4352/15/6/513 |
| work_keys_str_mv | AT ashothgevorgyan lightinducedhigherorderbraggresonanceinheliconicalcholestericliquidcrystals AT francescosimoni lightinducedhigherorderbraggresonanceinheliconicalcholestericliquidcrystals |