• Chinese Optics Letters
  • Vol. 13, Issue 8, 081603 (2015)
Can Yang, Sensen Li, Wensong Li, Haijie Zuo, Lujian Chen*, Baoping Zhang, and Zhiping Cai
Author Affiliations
  • Department of Electronic Engineering, School of Information Science and Engineering, Xiamen University, Xiamen 361005, China
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    DOI: 10.3788/COL201513.081603 Cite this Article Set citation alerts
    Can Yang, Sensen Li, Wensong Li, Haijie Zuo, Lujian Chen, Baoping Zhang, Zhiping Cai. Topologically patterning of polyvinyl alcohol microstructures for vertical-/hybrid-aligned nematic liquid-crystal gratings doped with polyhedral oligomeric silsesquioxane nanoparticles[J]. Chinese Optics Letters, 2015, 13(8): 081603 Copy Citation Text show less

    Abstract

    We demonstrate a soft lithography approach for fabrication of a topographically patterned polyvinyl alcohol (PVA) liquid-crystal (LC) alignment layer. This specific approach employs modified micromolding in capillaries for negative replication of the PVA microstructures on indium tin oxide (ITO) substrates from patterned poly(dimethylsiloxane) molds in a single step, leading to planar alignment on the desired regions. By doping with polyhedral oligomeric silsesquioxane nanoparticles, which can induce vertical alignment on bare ITO surfaces, periodic LC phase gratings based on an alternating vertical-aligned/hybrid-aligned nematic geometry are presented as an application, and a theoretical model was used to simulate and examine the experimental results.
    Δϕ=0d2πλ(neff(z)no)dz,(1)

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    neff(z)=noneno2cos2θ(z)+ne2sin2θ(z),(2)

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    η±1=1π2(1cosΔϕ)(1cos(2πD)).(3)

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    Can Yang, Sensen Li, Wensong Li, Haijie Zuo, Lujian Chen, Baoping Zhang, Zhiping Cai. Topologically patterning of polyvinyl alcohol microstructures for vertical-/hybrid-aligned nematic liquid-crystal gratings doped with polyhedral oligomeric silsesquioxane nanoparticles[J]. Chinese Optics Letters, 2015, 13(8): 081603
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