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Peer-reviewedCC BY 4.0ACS Central Science

Chemically Amplified Photoalignment for Grayscale Programming of Molecular Order and Optical Anisotropy in Liquid Crystal Polymers

  • Joy Zhou1
  • Elizabeth A. Recker1
  • Seth R. Allen1
  • Holden R. Robinson1
  • Jaechul Ju1
  • Sean T. Roberts1
  • Zachariah A. Page1
  1. 1The University of Texas at Austin , , , ,
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Abstract

Next-generation optical devices for beam shaping, spatial light modulation, and information storage will benefit from scalable methods to program molecular anisotropy in processable soft materials. Liquid crystal polymers (LCPs) are attractive platforms for this purpose because they combine orientational mobility and long-range order with the processability of polymeric materials, yet a general strategy for high-fidelity grayscale control of molecular order in single-layer LCP films remains an unmet challenge. Here, we address this challenge through molecular design of an azobenzene/cyanobiphenyl side-chain LCP, where a small fraction of photoisomerizable azobenzene units transduces visible light into bulk alignment of a birefringent cyanobiphenyl-rich matrix. This chemically amplified photoalignment strategy preserves light penetration while producing order parameters up to S ≈ 0.58. Excitation intensity controls molecular order through a thresholded and saturating response, captured by an empirical calibration that enables grayscale projections to be translated into spatial maps of molecular alignment along a specific axis. Photomask-free digital projections produced high-fidelity birefringent features down to ∼10 μm and an effective optical bit-depth exceeding 6 bits. Intensity-to-response correction improved grayscale fidelity in complex images and was transferable from microscale to centimeter-scale projection areas. This approach provides a scalable route to programming coupled opacity and polarization-dependent optical behavior in solid LCP films.

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Cite

BibTeXRIS
BibTeX
@article{zhou2026chemically,
  title = {{Chemically Amplified Photoalignment for Grayscale Programming of Molecular Order and Optical Anisotropy in Liquid Crystal Polymers}},
  author = {Joy Zhou and Elizabeth A. Recker and Seth R. Allen and Holden R. Robinson and Jaechul Ju and Sean T. Roberts and Zachariah A. Page},
  journal = {ACS Central Science},
  year = {2026},
  month = oct,
  doi = {10.1021/acscentsci.6c01355},
  url = {https://pubs.acs.org/acscii/article/doi/10.1021/acscentsci.6c01355/5451937/Chemically-Amplified-Photoalignment-for-Grayscale},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Chemically Amplified Photoalignment for Grayscale Programming of Molecular Order and Optical Anisotropy in Liquid Crystal Polymers
AU  - Joy Zhou
AU  - Elizabeth A. Recker
AU  - Seth R. Allen
AU  - Holden R. Robinson
AU  - Jaechul Ju
AU  - Sean T. Roberts
AU  - Zachariah A. Page
PY  - 2026
DA  - 2026/10/15
JO  - ACS Central Science
DO  - 10.1021/acscentsci.6c01355
UR  - https://pubs.acs.org/acscii/article/doi/10.1021/acscentsci.6c01355/5451937/Chemically-Amplified-Photoalignment-for-Grayscale
AB  - Next-generation optical devices for beam shaping, spatial light modulation, and information storage will benefit from scalable methods to program molecular anisotropy in processable soft materials. Liquid crystal polymers (LCPs) are attractive platforms for this purpose because they combine orientational mobility and long-range order with the processability of polymeric materials, yet a general strategy for high-fidelity grayscale control of molecular order in single-layer LCP films remains an unmet challenge. Here, we address this challenge through molecular design of an azobenzene/cyanobiphenyl side-chain LCP, where a small fraction of photoisomerizable azobenzene units transduces visible light into bulk alignment of a birefringent cyanobiphenyl-rich matrix. This chemically amplified photoalignment strategy preserves light penetration while producing order parameters up to S ≈ 0.58. Excitation intensity controls molecular order through a thresholded and saturating response, captured by an empirical calibration that enables grayscale projections to be translated into spatial maps of molecular alignment along a specific axis. Photomask-free digital projections produced high-fidelity birefringent features down to ∼10 μm and an effective optical bit-depth exceeding 6 bits. Intensity-to-response correction improved grayscale fidelity in complex images and was transferable from microscale to centimeter-scale projection areas. This approach provides a scalable route to programming coupled opacity and polarization-dependent optical behavior in solid LCP films.
SN  - 2374-7943
SN  - 2374-7951
ER  -