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Geometric phase flat optical gratings with high diffraction angle based on dual-frequency nematic liquid crystal

Inge Nys (UGent) , Sunqian Liu (UGent) , Yu-Nung Huang, Olga Strzezysz, Przemyslaw Kula and Kristiaan Neyts (UGent)
(2023) ADVANCED OPTICAL MATERIALS. 11(23).
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Abstract
Diffractive optical elements (DOEs) are increasingly used as lightweight and compact solutions in photonic devices. Steering of light and manipulation of the polarization can be efficiently obtained with the help of photo-aligned liquid crystal (LC) devices. 1D LC diffraction gratings are studied that are based on the geometric phase principle and demonstrate that the optical functionality can be substantially broadened by using dual frequency LC. Switching between a highly efficient diffractive and a transmissive state is obtained by adjusting the frequency of the applied electric field. Compared to commonly studied 1D nematic LC diffraction gratings, the steering efficiency over large diffraction angles is strongly increased. By using an appropriate electric-field treatment, the efficiency for first-order diffraction of red light over an angle of 12.6 & DEG; increases from 60% to 90%. Moreover, additional switching phenomena are observed at intermediate voltage treatments, leading to enhanced tunability of the DOEs. The origin of this behavior is explained with the help of finite element Q-tensor simulations for the director configuration.
Keywords
FABRICATION, DISPLAYS, ELEMENTS, diffraction gratings, dual-frequency liquid crystals, electrically tunable, flat optical components, optimized director configurations

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MLA
Nys, Inge, et al. “Geometric Phase Flat Optical Gratings with High Diffraction Angle Based on Dual-Frequency Nematic Liquid Crystal.” ADVANCED OPTICAL MATERIALS, vol. 11, no. 23, 2023, doi:10.1002/adom.202300972.
APA
Nys, I., Liu, S., Huang, Y.-N., Strzezysz, O., Kula, P., & Neyts, K. (2023). Geometric phase flat optical gratings with high diffraction angle based on dual-frequency nematic liquid crystal. ADVANCED OPTICAL MATERIALS, 11(23). https://doi.org/10.1002/adom.202300972
Chicago author-date
Nys, Inge, Sunqian Liu, Yu-Nung Huang, Olga Strzezysz, Przemyslaw Kula, and Kristiaan Neyts. 2023. “Geometric Phase Flat Optical Gratings with High Diffraction Angle Based on Dual-Frequency Nematic Liquid Crystal.” ADVANCED OPTICAL MATERIALS 11 (23). https://doi.org/10.1002/adom.202300972.
Chicago author-date (all authors)
Nys, Inge, Sunqian Liu, Yu-Nung Huang, Olga Strzezysz, Przemyslaw Kula, and Kristiaan Neyts. 2023. “Geometric Phase Flat Optical Gratings with High Diffraction Angle Based on Dual-Frequency Nematic Liquid Crystal.” ADVANCED OPTICAL MATERIALS 11 (23). doi:10.1002/adom.202300972.
Vancouver
1.
Nys I, Liu S, Huang Y-N, Strzezysz O, Kula P, Neyts K. Geometric phase flat optical gratings with high diffraction angle based on dual-frequency nematic liquid crystal. ADVANCED OPTICAL MATERIALS. 2023;11(23).
IEEE
[1]
I. Nys, S. Liu, Y.-N. Huang, O. Strzezysz, P. Kula, and K. Neyts, “Geometric phase flat optical gratings with high diffraction angle based on dual-frequency nematic liquid crystal,” ADVANCED OPTICAL MATERIALS, vol. 11, no. 23, 2023.
@article{01HC051AA4Y1GNY6EJG2D8JAKV,
  abstract     = {{Diffractive optical elements (DOEs) are increasingly used as lightweight and compact solutions in photonic devices. Steering of light and manipulation of the polarization can be efficiently obtained with the help of photo-aligned liquid crystal (LC) devices. 1D LC diffraction gratings are studied that are based on the geometric phase principle and demonstrate that the optical functionality can be substantially broadened by using dual frequency LC. Switching between a highly efficient diffractive and a transmissive state is obtained by adjusting the frequency of the applied electric field. Compared to commonly studied 1D nematic LC diffraction gratings, the steering efficiency over large diffraction angles is strongly increased. By using an appropriate electric-field treatment, the efficiency for first-order diffraction of red light over an angle of 12.6 & DEG; increases from 60% to 90%. Moreover, additional switching phenomena are observed at intermediate voltage treatments, leading to enhanced tunability of the DOEs. The origin of this behavior is explained with the help of finite element Q-tensor simulations for the director configuration.}},
  articleno    = {{2300972}},
  author       = {{Nys, Inge and Liu, Sunqian and Huang, Yu-Nung and  Strzezysz, Olga and  Kula, Przemyslaw and Neyts, Kristiaan}},
  issn         = {{2195-1071}},
  journal      = {{ADVANCED OPTICAL MATERIALS}},
  keywords     = {{FABRICATION,DISPLAYS,ELEMENTS,diffraction gratings,dual-frequency liquid crystals,electrically tunable,flat optical components,optimized director configurations}},
  language     = {{eng}},
  number       = {{23}},
  pages        = {{13}},
  title        = {{Geometric phase flat optical gratings with high diffraction angle based on dual-frequency nematic liquid crystal}},
  url          = {{http://doi.org/10.1002/adom.202300972}},
  volume       = {{11}},
  year         = {{2023}},
}
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