Abstract
Control over the orientational order of liquid crystals (LCs) is critical to optical switching and display applications. Porous polymer networks have been used to influence the orientation of embedded chiral liquid crystals1, yielding for example reflective displays. Here we show that inorganic films with a porous structure engineered on the submicrometre scale by glancing-angle deposition2,3 can be used to control the orientation of LCs impregnated into the voids. The inorganic material contains helical columns that orient rod-like nematic LCs into a phase similar to a chiral nematic1,4 but with direct control of the local molecular arrangement (for example, the helical pitch) imposed by the inorganic microstructure. We also show that reactive LC molecules in this composite material can be crosslinked by photopolymerization while retaining the imposed structure.
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References
Crawford, G. P. & Zumer, S. (eds) Liquid Crystals in Complex Geometries(Taylor and Francis, London, 1996 ).
Robbie, K. & Brett, M. J. Sculptured thin films and glancing angle deposition: growth mechanics and applications. J. Vac. Sci. Technol. A 15, 1460–1465 (1997).
Robbie, K., Sit, J. C. & Brett, M. J. Advanced techniques for glacing angle deposition. J. Vac. Sci. Technol. B 16, 1115–1122 (1998).
Belyakov, V. A. & Dmitrienko, V. E. Optics of chiral liquid crystals. Sov. Sci. Rev. A 13, 1989).
Young, N. O. & Kowal, J. Optically active fluorite films. Nature 183, 104–105 ( 1959).
Azzam, RM. A. Chiral thin solid films: method of deposition and applications Appl. Phys. Lett. 61, 3118–3120 (1992).
Hodgkinson, I. J. & Wu, Q. H. Birefringent Thin Films and Polarizing Elements(World Scientific, Singapore, 1997).
van Kranenburg, H. & Lodder, J. C. Tailoring growth and local composition by oblique-incidence deposition: a review and new experimental data. Mater. Sci. Eng. R 11, 295– 354 (1994).
Robbie, K., Friedrich, L. J., Dew, S. K., Smy, T. & Brett, M. J. Fabrication of thin films with highly porous microstructures. J. Vac. Sci. Technol. A 13, 1032–1035 (1995).
Lakhataki, A. & Weiglhofer, W. S. On light propagation in helicoidal bianisotropic mediums. Proc. R. Soc. Lond. A 448, 419–437 (1995).
Robbie, K., Brett, M. J. & Lakhtakia, A. First thin film realization of a helicoidal bianisotropic medium. J. Vac. Sci. Technol. A 13, 2991 –2993 (1995).
Robbie, K., Brett, M. J. & Lakhtakia, A. Chiral sculptured thin films. Nature 384, 616 (1996).
Rovira, P. I. et al. Rotating-compensator multichannel transmission ellipsometry of a thin-film helicoidal bianisotropic medium. Thin Solid Films 313–314;, 373–378 (1998).
Barron, L. D. Molecular Light Scattering and Optical Activity(Cambridge Univ. Press, 1982).
Chandrasekhar, S. Liquid Crystals(Cambridge Univ. Press, 1977).
Robbie, K., Hnatiw, A. J. P., Brett, M. J., MacDonald, R. I. & McMullin, J. N. Inhomogeneous thin film optical filters fabricated using glancing angle deposition. Electron. Lett. 33, 1213–1214 (1997).
Sit, J. C., Vick, D., Robbie, K. & Brett, M. J. Thin film microstructural control using glancing angle deposition by sputtering. J. Mater. Res. 14, 1197–1199 ( 1999).
Xu, F., Kitzerow, H.-S. & Crooker, P. P. Electric-field effects on nematic droplets with negative dielectric anisotropy. Phys. Rev. E 46, 6535–6540 (1992).
Ondris-Crawford, R. J. et al. Surface molecular anchoring in microconfined liquid crystals near the nematic-smectic-A transition. Phys. Rev. E 48, 1998–2005 (1993).
Berreman, D. W. Optics in stratified and anisotropic media: 4 × 4-matrix formulation. J. Opt. Soc. Am. 62, 502– 510 (1972).
St John, W. D., Fritz, W. J., Lu, Z. J. & Yang, D.-K. Bragg reflection from cholesteric liquid crystals. Phys. Rev. E 51, 1191–1198 (1995).
Xu, M., Xu, F. & Yang, D.-K. Effects of cell structure on the reflection of cholesteric liquid crystal displays. J. Appl. Phys. 83, 1938– 1944 (1998).
Broer, D. J., Lub, J. & Mol, G. N. Wide-band reflective polarizers from cholesteric polymer networks with a pitch gradient. Nature 378, 467– 469 (1995).
Acknowledgements
This work was supported in part by the Natural Sciences and Engineering Council of Canada and the Alberta Microelectronic Centre.
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Robbie, K., Broer, D. & Brett, M. Chiral nematic order in liquid crystals imposed by an engineered inorganic nanostructure. Nature 399, 764–766 (1999). https://doi.org/10.1038/21612
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DOI: https://doi.org/10.1038/21612
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