Journal of Photonic Materials and Technology

Submit a Manuscript

Publishing with us to make your research visible to the widest possible audience.

Propose a Special Issue

Building a community of authors and readers to discuss the latest research and develop new ideas.

The Temperature Dependence of Optical Texture in Chiral Nematic Liquid Crystal Observed by Polarizing Microscope

Study the optical-thermal dependence of liquid crystal based on the quantity data of image texture is important to get more information accurately. In this research, the optical-thermal dependence of chiral nematic liquid crystals ink sample was investigated based on the texture and color changes of the sample at various temperatures. The textures of the samples were recorded by the crossed-polarizing optical microscope attached to the hot stage and a camera. The temperature dependence of textures are represented by the hue parameter values taken from the HSV image type. The result obtained from the graph of the increase mean hue parameter against the temperatures was in accordance with the preceding results done by the various techniques. The results show that the higher the temperature of the material, the higher the average hue value. The increase in the hue parameter relates to the color changes of texture from red-dominant to green-dominant. The color difference appeared in various wavelengths represent a diffraction pattern caused by its optically active and the twisted molecular structure. Approaching to the Bragg diffraction equation, the pitch obtained at 0.7 µm. Furthermore, the relation of the different textures and the twist structure of the sample was evaluated. Considering the sample thickness of 100 µm carries out to the conclusion that there are hundreds of twisted nematic liquid crystal molecules in various alignment on a volume space.

Optical Texture, Temperature, Polarizing Microscope, Chiral Nematic Liquid Crystal, Hue, Diffraction

APA Style

Risti Suryantari, Flaviana Catherine. (2020). The Temperature Dependence of Optical Texture in Chiral Nematic Liquid Crystal Observed by Polarizing Microscope. Journal of Photonic Materials and Technology, 6(2), 21-27. https://doi.org/10.11648/j.jmpt.20200602.12

ACS Style

Risti Suryantari; Flaviana Catherine. The Temperature Dependence of Optical Texture in Chiral Nematic Liquid Crystal Observed by Polarizing Microscope. J. Photonic Mater. Technol. 2020, 6(2), 21-27. doi: 10.11648/j.jmpt.20200602.12

AMA Style

Risti Suryantari, Flaviana Catherine. The Temperature Dependence of Optical Texture in Chiral Nematic Liquid Crystal Observed by Polarizing Microscope. J Photonic Mater Technol. 2020;6(2):21-27. doi: 10.11648/j.jmpt.20200602.12

Copyright © 2020 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

1. S. Chandrasekhar, Liquid Crystal, New York: Cambridge University Press, 1992.
2. Yang, Deng-Ke & Wu, Shin-Tson, Fundamentals of Liquid Crystal Devices, John Wiley & Son Ltd, 2006.
3. Hallcrest, Handbook of Thermochromic Liquid Crystal Technology, Glenview, IL: Hallcrest., 1991.
4. Ian Sage. (2011). Thermochromic liquid crystals, Liquid Crystals, 38: 11-12, 1551-1561.
5. Shuang Zhou. (2018). Recent progresses in lyotropic chromonic liquid crystal research: elasticity, viscosity, defect structures, and living liquid crystals, Liquid Crystals Today, 27: 4, 91-108.
6. David Coates. (2015). Development and applications of cholesteric liquid crystals, Liquid Crystals, 42: 5-6, 653-665.
7. Stasiek, J., Kowalewski, Tomasz. (2002). Thermochromic liquid crystals in heat transfer research, Proceedings of SPIE - The International Society for Optical Engineering, 10 (1), 1–10.
8. Nastishin, Yu A., et al. (2005). Optical characterization of the nematic lyotropic chromonic liquid crystals: Light absorption, birefringence, and scalar order parameter. Physical Review, E 72.4: 041711.
9. Smalyukh, Ivan I., S. V. Shiyanovskii, and O. D. Lavrentovich. (2001). Three-dimensional imaging of orientational order by fluorescence confocal polarizing microscopy. Chemical Physics Letters, 336.1-2: 88-96.
10. Sigaki Higor, Y. D., Lenzi, E. K., Zola, R. S., Matjaž, P., & Ribeiro, H. V. (2020). Learning physical properties of liquid crystals with deep convolutional neural networks. Scientific Reports (Nature Publisher Group), 10 (1).
11. B. T. P. Madhav, P. Pardhasaradhi, R. K. N. R. Manepalli & V. G. K. M. Pisipati. (2015). Histogram equalization technique to analyse induced cholesteric phase in nanodoped liquid crystalline compound. Liquid Crystals, 42: 7, 989-997.
12. K. Bjorknas, M. A. Geday & E. P. Raynes. (2003). Quantitative conoscopic imaging of cholesteric thin films. Liquid Crystals, 30: 8, 889-897.
13. S. Sreehari Sastry, K. Mallika, B. Gowri Sankara Rao, Ha Sie Tiong & S. Lakshminarayana. (2012). Identification of phase transition temperatures by statistical image analysis, Liquid Crystals, 39: 6, 695-700.
14. S. Sreehari Sastry, S. T. Ha, B. Gowri Sankara Rao, K. Mallika & T. Vindhya Kumari. (2012). Optical properties of a mesogen by image analysis, Liquid Crystals, 39: 11, 1414-1419.
15. Gonzales, R. C., Woods, R. E., Digital Image Processing, 2ed, Prentice Hall, 2002.
16. Information on https://www.mathworks.com/help.
17. Tanaka, S., Yoshida, H., Kawata, Y. et al. (2015). Double-twist cylinders in liquid crystalline cholesteric blue phases observed by transmission electron microscopy. Sci Rep 5, 16180.
18. Bharara, Manish, Liquid Crystal Thermography in Neuropathic Assessment of Diabetic Foot, PhD Thesis, Bournemouth University, 2007.
19. Ingo Dierking, Textures of Liquid Crystals, Wiley-VCH Verlag GmbH & Co. KGaA, 2003.
20. O. Lavrentovich. (2020). Electromagnetically tunable cholesterics with oblique helicoidal structure. Opt. Mater. Express 10, 2415-2424.