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Multiband reflectors based on stacked Single-Pitch cholesteric liquid crystal films

Yu-Chieh Li, Bo-Han Lin, Kristiaan Neyts (UGent) , Jeroen Beeckman (UGent) and Chun-Ta Wang (UGent)
(2025) OPTICS AND LASER TECHNOLOGY. 190.
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Abstract
Multiband and broadband cholesteric liquid crystal (CLC) reflectors have gained increasing attention due to their self-assembled helical structures, selective reflection of circularly polarized light, and tunable reflection bands. However, most existing approaches rely on complex fabrication processes or diverse CLC mixtures. In this study, we propose a multiband reflector realized by stacking multiple layers of single-pitch CLCs. The observed multiband reflection arises from boundary defect modes formed at the layer-by-layer interfaces. The reflection bands can be tuned by adjusting the dilution ratio of the CLC solution and the initial pitch length. Moreover, the multilayer reflector maintains perfect circular polarization selectivity, exhibiting no reflection under opposite-handed circularly polarized light. Additionally, a polarization volume grating (PVG) with multiband diffraction behavior is demonstrated based on the proposed multilayer CLC reflector. This simplified fabrication approach using single-pitch CLCs enhances the practicality and applicability of multiband reflective structures.
Keywords
Cholesteric liquid crystals, Defect modes, Polymer films, Multiband reflection, Polarization volume gratings, MIRRORS

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MLA
Li, Yu-Chieh, et al. “Multiband Reflectors Based on Stacked Single-Pitch Cholesteric Liquid Crystal Films.” OPTICS AND LASER TECHNOLOGY, vol. 190, 2025, doi:10.1016/j.optlastec.2025.113290.
APA
Li, Y.-C., Lin, B.-H., Neyts, K., Beeckman, J., & Wang, C.-T. (2025). Multiband reflectors based on stacked Single-Pitch cholesteric liquid crystal films. OPTICS AND LASER TECHNOLOGY, 190. https://doi.org/10.1016/j.optlastec.2025.113290
Chicago author-date
Li, Yu-Chieh, Bo-Han Lin, Kristiaan Neyts, Jeroen Beeckman, and Chun-Ta Wang. 2025. “Multiband Reflectors Based on Stacked Single-Pitch Cholesteric Liquid Crystal Films.” OPTICS AND LASER TECHNOLOGY 190. https://doi.org/10.1016/j.optlastec.2025.113290.
Chicago author-date (all authors)
Li, Yu-Chieh, Bo-Han Lin, Kristiaan Neyts, Jeroen Beeckman, and Chun-Ta Wang. 2025. “Multiband Reflectors Based on Stacked Single-Pitch Cholesteric Liquid Crystal Films.” OPTICS AND LASER TECHNOLOGY 190. doi:10.1016/j.optlastec.2025.113290.
Vancouver
1.
Li Y-C, Lin B-H, Neyts K, Beeckman J, Wang C-T. Multiband reflectors based on stacked Single-Pitch cholesteric liquid crystal films. OPTICS AND LASER TECHNOLOGY. 2025;190.
IEEE
[1]
Y.-C. Li, B.-H. Lin, K. Neyts, J. Beeckman, and C.-T. Wang, “Multiband reflectors based on stacked Single-Pitch cholesteric liquid crystal films,” OPTICS AND LASER TECHNOLOGY, vol. 190, 2025.
@article{01JWJKV40PKE5W7HGY9YBBY8G2,
  abstract     = {{Multiband and broadband cholesteric liquid crystal (CLC) reflectors have gained increasing attention due to their self-assembled helical structures, selective reflection of circularly polarized light, and tunable reflection bands. However, most existing approaches rely on complex fabrication processes or diverse CLC mixtures. In this study, we propose a multiband reflector realized by stacking multiple layers of single-pitch CLCs. The observed multiband reflection arises from boundary defect modes formed at the layer-by-layer interfaces. The reflection bands can be tuned by adjusting the dilution ratio of the CLC solution and the initial pitch length. Moreover, the multilayer reflector maintains perfect circular polarization selectivity, exhibiting no reflection under opposite-handed circularly polarized light. Additionally, a polarization volume grating (PVG) with multiband diffraction behavior is demonstrated based on the proposed multilayer CLC reflector. This simplified fabrication approach using single-pitch CLCs enhances the practicality and applicability of multiband reflective structures.}},
  articleno    = {{113290}},
  author       = {{Li, Yu-Chieh and Lin, Bo-Han and Neyts, Kristiaan and Beeckman, Jeroen and Wang, Chun-Ta}},
  issn         = {{0030-3992}},
  journal      = {{OPTICS AND LASER TECHNOLOGY}},
  keywords     = {{Cholesteric liquid crystals,Defect modes,Polymer films,Multiband reflection,Polarization volume gratings,MIRRORS}},
  language     = {{eng}},
  pages        = {{7}},
  title        = {{Multiband reflectors based on stacked Single-Pitch cholesteric liquid crystal films}},
  url          = {{http://doi.org/10.1016/j.optlastec.2025.113290}},
  volume       = {{190}},
  year         = {{2025}},
}
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