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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 21 — Oct. 11, 2010
  • pp: 21594–21602

Superior optical properties of homogeneous liquid crystal alignment on a tin (IV) oxide surface sequentially modulated via ion beam irradiation

Young-Gu Kang, Hong-Gyu Park, Hyung-Jun Kim, Young-Hwan Kim, Byeong-Yun Oh, Byoung-Yong Kim, Dai-Hyun Kim, and Dae-Shik Seo  »View Author Affiliations


Optics Express, Vol. 18, Issue 21, pp. 21594-21602 (2010)
http://dx.doi.org/10.1364/OE.18.021594


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Abstract

We first investigated the alignment characteristics of tin (IV) oxide (SnO2) thin films deposited by radio-frequency (RF) magnetron sputtering. This study demonstrates that liquid crystal (LC) molecules could be aligned homogeneously by controlling the Ion Beam (IB) irradiation energy densities. We also show that the pretilt angle of the LC molecules has a close relation with the surface energy. X-ray photoelectron spectroscopy (XPS) indicates that a non-stoichiometric SnO2-x surface converted by ion beam irradiation can horizontally align the LC molecules. The measured electro-optical (EO) characteristics showed high performance, comparable with those of rubbed and ion-beam irradiated polyimide (PI) layers.

© 2010 OSA

OCIS Codes
(160.3710) Materials : Liquid crystals
(160.4760) Materials : Optical properties
(220.1140) Optical design and fabrication : Alignment

ToC Category:
Materials

History
Original Manuscript: March 16, 2010
Revised Manuscript: September 23, 2010
Manuscript Accepted: September 26, 2010
Published: September 28, 2010

Citation
Young-Gu Kang, Hong-Gyu Park, Hyung-Jun Kim, Young-Hwan Kim, Byeong-Yun Oh, Byoung-Yong Kim, Dai-Hyun Kim, and Dae-Shik Seo, "Superior optical properties of homogeneous liquid crystal alignment on a tin (IV) oxide surface sequentially modulated via ion beam irradiation," Opt. Express 18, 21594-21602 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-21-21594


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References

  1. S. Varghese, G. P. Crawford, C. W. M. Bastiaansen, D. K. G. de Boer, and D. J. Broer, “Microrubbing technique to produce high pretilt multidomain liquid crystal alignment,” Appl. Phys. Lett. 85(2), 230 (2004). [CrossRef]
  2. J. Y. L. Ho, V. G. Chigrinov, and H. S. Kwok, “Variable liquid crystal pretilt angles generated by photoalignment of a mixed polyimide alignment layer,” Appl. Phys. Lett. 90(24), 243506 (2007). [CrossRef]
  3. S. Park, C. Padeste, H. Schift, J. Gobrecht, and T. Scharf, “Chemical nanopatterns via nanoimprint lithography for simultaneous control over azimuthal and polar alignment of liquid crystals,” Adv. Mater. 17(11), 1398–1401 (2005). [CrossRef]
  4. J. L. Janning, “Thin film surface orientation for liquid crystals,” Appl. Phys. Lett. 21(4), 173 (1972). [CrossRef]
  5. J. Stöhr, M. G. Samant, J. Luning, A. C. Callegari, P. Chaudhari, J. P. Doyle, J. A. Lacey, S. A. Lien, S. Purushothaman, and J. L. Speidell, “Liquid crystal alignment on carbonaceous surfaces with orientational order,” Science 292(5525), 2299–2302 (2001). [CrossRef] [PubMed]
  6. S. K. Lee, J. H. Kim, B. Y. Oh, D. H. Kang, B. Y. Kim, J. W. Han, Y. H. Kim, J. M. Han, J. Y. Hwang, C. H. Ok, and D. S. Seo, “Liquid crystal alignment effects on SiNx thin film layers treated by ion-beam irradiation,” Jpn. J. Appl. Phys. 46(12), 7711–7713 (2007). [CrossRef]
  7. W. K. Lee, J. H. Choi, H. J. Na, J. H. Lim, J. M. Han, J. Y. Hwang, and D. S. Seo, “Low-power operation of vertically aligned liquid-crystal system via anatase-TiO(2) nanoparticle dispersion,” Opt. Lett. 34(23), 3653–3655 (2009). [CrossRef] [PubMed]
  8. E. Shanthi, V. Dutta, A. Banerjee, and K. L. Chopra, “Electrical and optical properties of undoped and antimony-doped tin oxide films,” J. Appl. Phys. 51(12), 6243 (1980). [CrossRef]
  9. S. Shuzhen, S. Jianda, L. Chunyan, Y. Kui, F. Zhengxiu, and C. Lei, “High-reflectance 193 nm Al2O3/MgF2 mirrors,” Appl. Surf. Sci. 249(1-4), 157–161 (2005). [CrossRef]
  10. T. Du, H. Y. Mak, P. Xu, V. Chigrinov, and H. S. Kwok, “Single Twist nematic mode single cell gap transflective liquid crystal display,” Jpn. J. Appl. Phys. 48(1), 010209 (2009). [CrossRef]
  11. M. Oh-e, M. Yoneya, and K. Kondo, “Switching of negative and positive dielectro-anisotropic liquid crystals by in-plane electric fields,” J. Appl. Phys. 82(2), 528 (1997). [CrossRef]
  12. J. H. Song, Y. J. Lim, M.-H. Lee, S. H. Lee, and S. T. Shin, “Electro-optical characteristics and switching principle of a single-cell-gap transflective liquid-crystal display associated with in-plane rotation of liquid crystal driven by fringe-field,” Appl. Phys. Lett. 87(1), 011108 (2005). [CrossRef]
  13. J. T. K. Wan, O. K. C. Tsui, H.-S. Kwok, and P. Sheng, “Liquid crystal pretilt control by inhomogeneous surfaces,” Phys. Rev. E Stat. Nonlin. Soft Matter Phys. 72(2), 021711 (2005). [CrossRef] [PubMed]
  14. L. T. Creagh and A. R. Kmetz, “Mechanism of surface alignment in nematic liquid crystals,” Mol. Cryst. Liq. Cryst. (Phila. Pa.) 24(1), 59–68 (1973). [CrossRef]
  15. M. Kwoka, L. Ottaviano, M. Passacantando, S. Santucci, G. Czempik, and J. Szuber, “XPS study of the surface chemistry of L-CVD SnO2 thin films after oxidation,” Thin Solid Films 490(1), 36–42 (2005). [CrossRef]
  16. A. L. Morales, A. Montes, S. Y. Lopez, N. Raigoza, and C. A. Duque, “Donor-related density of states and polarizability in a GaAs-(Ga,Al)As quantum-well under hydrostatic pressure and applied electric field,” Phys. Status Solidi C 0(2), 652–656 (2003). [CrossRef]
  17. M. Medved, P. W. Fowler, and J. M. Hutson, “Anisotropic dipole polarizabilities and quadrupole moments of open-shell atoms and ions: O, F, S, Cl, Se, Br and isoelectronic systems,” Mol. Phys. 98(7), 453–463 (2000). [CrossRef]
  18. J. B. Kim, C. J. Choi, J. S. Park, S. J. Jo, B. H. Hwang, M. K. Jo, D. Kang, S. J. Lee, Y. S. Kim, and H. K. Baik, “Orientational transition of liquid crystal molecules by a photoinduced transformation process into a recovery-free silicon oxide layer,” Adv. Mater. 20(16), 3073–3078 (2008). [CrossRef]
  19. P. W. Langhoff, R. G. Gordon, and M. Karplus, “Comparisons of dispersion force bounding methods with applications to anisotropic interactions,” J. Chem. Phys. 55(5), 2126 (1971). [CrossRef]

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