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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 10 — May. 20, 2013
  • pp: 12135–12144

Determination of surface nematic liquid crystal anchoring strength using nano-scale surface grooves

Yoonseuk Choi, Hiroshi Yokoyama, and Jin Seog Gwag  »View Author Affiliations


Optics Express, Vol. 21, Issue 10, pp. 12135-12144 (2013)
http://dx.doi.org/10.1364/OE.21.012135


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Abstract

Based on several nano-scale groove models, we propose a new technique to simultaneously determine the azimuthal and polar surface anchoring strengths of nematic liquid crystal (LC). The optical analysis of LCs on a grooved surface made by nanoimprinting lithography was performed on special alignment material, using a typical rubbing process. In our approach, using a polarizing microscope, we can determine the LC alignment exactly as it is in a parallel state, rather than a twisted state. This simple proposed method gives an accurate value of the surface LC anchoring of various surfaces, as well as simultaneously measuring the azimuthal and polar anchoring energy.

© 2013 OSA

OCIS Codes
(120.2040) Instrumentation, measurement, and metrology : Displays
(160.3710) Materials : Liquid crystals
(230.3720) Optical devices : Liquid-crystal devices
(240.0240) Optics at surfaces : Optics at surfaces

ToC Category:
Optical Devices

History
Original Manuscript: April 9, 2013
Revised Manuscript: May 6, 2013
Manuscript Accepted: May 7, 2013
Published: May 10, 2013

Citation
Yoonseuk Choi, Hiroshi Yokoyama, and Jin Seog Gwag, "Determination of surface nematic liquid crystal anchoring strength using nano-scale surface grooves," Opt. Express 21, 12135-12144 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-10-12135


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References

  1. W. M. Gibbons, P. J. Shannon, S. T. Sun, and B. J. Swetlin, “Surface-mediated alignment of nematic liquid crystals with polarized laser light,” Nature351(6321), 49–50 (1991). [CrossRef]
  2. N. Kawatsuki, T. Yamamoto, and H. Ono, “Photoinduced alignment control of photoreactive side-chain polymer liquid crystal by linearly polarized ultraviolet light,” Appl. Phys. Lett.74(7), 935–937 (1999). [CrossRef]
  3. J.-H. Kim, S. Kumar, and S.-D. Lee, “Alignment of liquid crystals on polyimide films exposed to ultraviolet light,” Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics57(5), 5644–5650 (1998). [CrossRef]
  4. M. Schadt, H. Seiberle, and A. Schuster, “Optical patterning of multi-domain liquid-crystal displays with wide viewing angles,” Nature381(6579), 212–215 (1996). [CrossRef]
  5. P. Chaudhari, J. Lacey, J. Doyle, E. Galligan, S. C. Lien, A. Callegari, G. Hougham, N. D. Lang, P. S. Andry, R. John, K. H. Yang, M. Lu, C. Cai, J. Speidell, S. Purushothaman, J. Ritsko, M. Samant, J. Stöhr, Y. Nakagawa, Y. Katoh, Y. Saitoh, K. Sakai, H. Satoh, S. Odahara, H. Nakano, J. Nakagaki, and Y. Shiota, “Atomic-beam alignment of inorganic materials for liquid-crystal displays,” Nature411(6833), 56–59 (2001). [CrossRef] [PubMed]
  6. J.-H. Kim, M. Yoneya, and H. Yokoyama, “Tristable nematic liquid-crystal device using micropatterned surface alignment,” Nature420(6912), 159–162 (2002). [CrossRef] [PubMed]
  7. J. L. Janning, “Thin film surface orientation for liquid crystals,” Appl. Phys. Lett.21(4), 173–174 (1972). [CrossRef]
  8. P. G. de Gennes and J. Prost, The Physics of Liquid Crystals (Oxford University Press, Oxford, 1974), 75–85.
  9. H. Yokoyama, Handbook of Liquid Crystal Research, P. J. Collings and J. S. Patel, ed. (Oxford University Press, Oxford, 1997), Chap. 6.
  10. K. H. Yang, “Freedericksz transition of twisted nematic cells,” Appl. Phys. Lett.43(2), 171–173 (1983). [CrossRef]
  11. M. Rüetschi, P. Grütter, J. Fünfschilling, and H.-J. Güntherodt, “Creation of Liquid Crystal Waveguides with Scanning Force Microscopy,” Science265, 512–514 (1994). [CrossRef] [PubMed]
  12. B. Zhang, F. K. Lee, O. K. C. Tsui, and P. Sheng, “Liquid crystal orientation transition on microtextured substrates,” Phys. Rev. Lett.91(21), 215501 (2003). [CrossRef] [PubMed]
  13. F. K. Lee, B. Zhang, P. Sheng, H. S. Kwok, and O. K. C. Tsui, “Continuous liquid crystal pretilt control through textured substrates,” Appl. Phys. Lett.85(23), 5556–5558 (2004). [CrossRef]
  14. K. H. Yang, “Weak boundary storage effect in homogeneous liquid crystal cells,” Jpn. J. Appl. Phys.22(Part 1), 389–393 (1983). [CrossRef]
  15. M. E. Becker, J. Nehring, and T. J. Scheffer, “Theory of twisted nematic layers with weak boundary,” J. Appl. Phys.57(10), 4539–4542 (1985). [CrossRef]
  16. A. Sugimura, G. R. Luckhurst, and O.-Y. Zhong-can, “Director deformation of a twisted chiral nematic liquid crystal cell with weak anchoring boundaries,” Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics52(1), 681–689 (1995). [CrossRef] [PubMed]
  17. H. Yokoyama and H. A. van Sprang, “A novel method for determining the anchoring energy function at a nematic liquid crystal-wall interface from director distortions at high,” J. Appl. Phys. 1985, 57, 4520 (1985).
  18. K. H. Yang and C. Rosenblatt, “Determination of the anisotropic potential at the nematic liquid crystal –to-wall interface,” Appl. Phys. Lett.43(1), 62 (1983). [CrossRef]
  19. C. Rosenblatt, “Temperature dependence of the anchoring strength coefficient at a nematic liquid crystal-wall,” J. Phys. France45(6), 1087–1091 (1984). [CrossRef]
  20. G. Porte, “Tilted alignment of MBBA induced by short-chain surfactants,” J. Phys. France37(10), 1245–1252 (1976). [CrossRef]
  21. Yu. A. Nastishin, R. D. Polak, S. V. Shiyanovskii, and O. D. Lavrentovich, “Determination of nematic polar anchoring from retardation versus voltage measurements,” Appl. Phys. Lett.75(2), 202–204 (1999). [CrossRef]
  22. Y. Iimura, N. Kobayashi, and S. Kobayashi, “A new method for measuring the azimuthal anchoring energy of a nematic liquid crystal,” Jpn. J. Appl. Phys.33(Part 1), L434–L436 (1994). [CrossRef]
  23. J. S. Gwag, S. J. Kim, J. G. You, J. Y. Lee, J. C. Kim, and T.-H. Yoon, “Surface-anchoring properties related to the distribution of polyimide chains in a twisted nematic liquid-crystal cell,” Opt. Lett.30(11), 1387–1389 (2005). [CrossRef] [PubMed]
  24. J. S. Gwag, J. Yi, and J. H. Kwon, “Determination of actual surface azimuthal anchoring strength using a wedge-shaped liquid crystal cell,” Opt. Lett.35(4), 456–458 (2010). [CrossRef] [PubMed]
  25. F. Yang and J. R. Sambles, “The influence of surface reflectivities on measurement of the torsional anchoring strength of nematic liquid crystals,” Jpn. J. Appl. Phys.37(Part 1), 3998–4007 (1998). [CrossRef]
  26. D. Berreman, “Solid Surface Shape and the Alignment of an Adjacent Nematic Liquid Crystal,” Phys. Rev. Lett.28(26), 1683–1686 (1972). [CrossRef]
  27. J. Fukuda, M. Yoneya, and H. Yokoyama, “Surface-Groove-Induced Azimuthal Anchoring of a Nematic Liquid Crystal: Berreman’s Model Reexamined,” Phys. Rev. Lett.98(18), 187803 (2007). [CrossRef] [PubMed]
  28. J. I. Fukuda, J. S. Gwag, M. Yoneya, and H. Yokoyama, “Theory of anchoring on a two-dimensionally grooved surface,” Phys. Rev. E Stat. Nonlin. Soft Matter Phys.77(1), 011702 (2008). [CrossRef] [PubMed]
  29. J. S. Gwag, J. Fukuda, M. Yoneya, and H. Yokoyama, “In-plane bistable nematic liquid crystal devices based on nanoimprinted surface relief,” Appl. Phys. Lett.91(7), 073504 (2007). [CrossRef]
  30. J. S. Gwag, J.-H. Kim, M. Yoneya, and H. Yokoyama, “Surface nematic bistability at nanoimprinted topography,” Appl. Phys. Lett.92(15), 153110 (2008). [CrossRef]
  31. J. S. Gwag, J. H. Kwon, M. Oh-e, J. Niitsuma, M. Yoneya, and H. Yokoyama, “Higher-order surface free energy in azimuthal nematic anchoring on nanopatterned grooves,” Appl. Phys. Lett.95(10), 103101 (2009). [CrossRef]
  32. M. Cui and J. R. Kelly, “Temperature dependence of visco-elastic properties of 5CB,” Mol. Cryst. Liq. Cryst. (Phila. Pa.)331(1), 49–57 (1999). [CrossRef]
  33. J. Nehring and A. Saupe, “On the Elastic Theory of Uniaxial Liquid Crystals,” J. Chem. Phys.54(1), 337–343 (1971). [CrossRef]
  34. S. Faetti, “Azimuthal anchoring energy of a nematic liquid crystal at a grooved interface,” Phys. Rev. A36(1), 408–410 (1987). [CrossRef] [PubMed]
  35. J. S. Gwag, M. Oh-e, M. Yoneya, H. Yokoyama, H. Satou, and S. Itami, “Advanced nanoimprint lithography using a graded functional imprinting material tailored for liquid crystal alignment,” J. Appl. Phys.102(6), 063501 (2007). [CrossRef]

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