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Optical Measurements and Speckle Photography for Thermotropic Liquid Crystals Mixtures

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DOI: 10.4236/jmp.2013.44073    4,029 Downloads   5,909 Views   Citations
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ABSTRACT

In this work, an experimental approach of speckle photography was used for measuring birefringence of thermotropic liquid crystals mixtures at different wavelengths in the visible region. Also the dispersion relations were investigated. The values of the refractive indices were measured for these mixtures of thermotropic liquid crystals in isotropic and liquid crystal phase at different wavelengths. The effect of the end group of these LCs used on the values of birefringence was investigated and discussed.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

A. Zaki, "Optical Measurements and Speckle Photography for Thermotropic Liquid Crystals Mixtures," Journal of Modern Physics, Vol. 4 No. 4, 2013, pp. 517-521. doi: 10.4236/jmp.2013.44073.

References

[1] L. McKenna, L. S. Miller and I. R. Peterson, “Polymer Dispersed Liquid Crystal Films for Modulating Infra-Red Radiation,” Polymer, Vol. 45, No. 20, 2004, pp. 6977-6984. doi:10.1016/j.polymer.2004.07.033
[2] B.-E. Benkelfata, E.-H. Horachea, Q. Zoua and B. Vinouzeb, “An Electro-Optic Modulation Technique for Direct and Accurate Measurement Of Birefringence,” Optics Communication, Vol. 221, No. 4-6, 2003, pp. 271-278. doi:10.1016/S0030-4018(03)01539-6
[3] R. Manohar and J. P. Shukla, “Refractive Indices, Order Parameter and Principal Polarizability of Cholesteric Liquid Crystals and Their Homogeneous Mixtures,” Journal of Physics and Chemistry of Solids, Vol. 65, No. 10, 2004, pp. 1643-1650.
[4] S. Brugioni and R. Meucci, “Mid-Infrared Interferometric Measurement of Liquid Crystal Anisotropy,” Optics Communication, Vol. 230, No. 1, 2004, pp. 19-22.
[5] M. Manaia, A. Gharbia, J. P. Marceroub, H. T. Nguyenb and J. C. Rouillonb, “Optic and Electro-Optic Investigations on Smq, Smc_A and L Phases in Highly Chiral Compounds,” Physica B, Vol. 368, No. 1-4, 2005, pp. 168-178.
[6] F. A. Aouada , M. R. de Moura, P. R. G. Fernandes, A. F. Rubira and E. C. Muniz, “Optical and Morphological Characterization of Polyacrylamide Hydrogel and Liquid Crystal Systems,” European Polymer Journal, Vol. 41, No. 9, 2005, pp. 2134-2141. doi:10.1016/j.eurpolymj.2005.03.020
[7] Z. L. Cao, L. Xuan, L. F. Hu, X. H. Lu and Q. Q. Mu, “Temperature Effect on the Diffraction Efficiency of the Liquid Crystal Spatial Light Modulator,” Optics Communications, Vol. 267, No. 1, 2006, pp. 69-73. doi:10.1016/j.optcom.2006.06.003
[8] A. Jafari, A. Ghanadzadeh, H. Tajalli and M. Yeganeh, “Linear Optical Parameters of a Dyed Nematic Mixture in the Presence of an AC Voltage,” Optical Materials, Vol. 29, No. 8, 2007, pp. 1004-1009. doi:10.1016/j.optmat.2006.03.034
[9] N. Bitri, A. Gharbi and J. P. Marcerou, “Scanning Conoscopy Measurement of the Optical Properties of Chiral Smectic Liquid Crystals,” Physica B: Condensed Matter, Vol. 403, No. 21-22, 2008, pp. 3921-3927. doi:10.1016/j.physb.2008.07.033
[10] Al. Bobrovsky, A. Ryabchun, A. Medvedev and V. Shibaev, “Ordering Phenomena and Photoorientation Processes in Photochromic Thin Films of LC Chiral Azobenzene-Containing Polymer Systems,” Journal of Photochemistry and Photobiology A: Chemistry, Vol. 206, No. 1, 2009, pp. 46-52. doi:10.1016/j.jphotochem.2009.05.010
[11] T.-T. Tang, C.-Y. Kuo, R.-P. Pan, J.-M. Shieh and C.-L. Pan, “Strong Vertical Alignment of Liquid Crystal on Porous Anodic Aluminum Oxide Film,” Journal of Display Technology, Vol. 5, No. 9, 2009, pp. 350-354.
[12] R. I. Nessim, “Phase Behaviour of Binary Mixture of 4-Substituted Phenyl 4’-N-Alkoxybenzoates,” Liquid Crystals, Vol. 30, No. 2, 2003, pp. 211-218. doi:10.1080/0267829021000060241
[13] E. Hecht and A. Zajac, “Optics,” Addison-Wesley, Reading, Vol. 378, 1990, p. 282.
[14] M. Francon, “Information Processing Using Speckle Patterns,” In: J. C. Dainty, Ed., Laser Speckle and Related Phenomena, Springer-Verlag, New York, 1975. doi:10.1007/BFb0111439
[15] L. M. Bernardo and O. D. D. Soares, “Birefringence Measurements by Double Speckle Photography,” Applied Optics, Vol. 26, No. 5, 1987, pp. 769-772. doi:10.1364/AO.26.0769_1
[16] W. A. Crossland, J. H. Morrissy and B. Needham, “Tilt Angle Measurements of Nematic Phases of Cyano-Biphenyls Aligned by Obliquely Evaporated Films,” Journal of Physics D: Applied Physics, Vol. 9, No. 14, 1976, p. 2001. doi:10.1088/0022-3727/9/14/010
[17] T. A. El-Dessouki, N. I. Hendawy and A. A. Zaki, “Measuring Birefringence of Curved Sheet and Single Crystals by Double-Exposure Speckle Photography,” Optics and Lasers in Engineering, Vol. 47, No. 6, 2009, pp. 622-628. doi:10.1016/j.optlaseng.2008.12.006

  
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