Optical properties of a liquid crystal with small ordinary and extraordinary refractive indices and small optical anisotropy

• Autorzy: Kędzierski J. , Garbat K , Raszewski Z. , Kojdecki M. A. , Kowiorski K. , Jaroszewicz L. R. , Miszczyk E. , Dąbrowski R. , Zieliński J. , Piecek W.

Identyfikatory

DOI

10.2478/s11772-014-0196-9

• Języki publikacji: EN

Abstrakty

EN

Optical properties of a nematic liquid crystal with small refractive index and small birefringence were studied. The ordinary and extraordinary refractive indices and birefringence were measured as functions of temperature by using an Abbe refractometer and wedge nematic cells. From values of these indices the nematic orientational order parameter was calculated by using several methods and corresponding mathematical models. Kuczyński et al. method was found to be suitable for determining the order parameter also for materials featuring small ordinary refractive index, with unknown density.

Słowa kluczowe

EN

nematic liquid crystals; optical properties of nematics; nematic order parameter

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2014
• Tom: Vol. 22, No. 3
• Strony: 162--165
• Opis fizyczny: Bibliogr.13 poz., tab., wykr.

Twórcy

autor

Kędzierski J.

• Military University of Technology, 00-908 Warsaw, Poland

autor

Garbat K

• Military University of Technology, 00-908 Warsaw, Poland

autor

Raszewski Z.

• Military University of Technology, 00-908 Warsaw, Poland

autor

Kojdecki M. A.

• Military University of Technology, 00-908 Warsaw, Poland
• Institute of Mathematics and Cryptology, Military University of Technology, 00–908 Warsaw, Poland

autor

Kowiorski K.

• Military University of Technology, 00-908 Warsaw, Poland

autor

Jaroszewicz L. R.

• Military University of Technology, 00-908 Warsaw, Poland

autor

Miszczyk E.

• Kazimierz Pulaski University of Technology and Humanities, 26-600 Radom, Poland

autor

Dąbrowski R.

• Military University of Technology, 00-908 Warsaw, Poland

autor

Zieliński J.

• Military University of Technology, 00-908 Warsaw, Poland

autor

Piecek W.

• Military University of Technology, 00-908 Warsaw, Poland

Bibliografia

• 1. R. Dąbrowski, J. Dziaduszek, Z. Stolarz, and J. Kędzierski, “Liquid crystalline materials with low ordinary refraction index”, J. Opt. Technol. 72, 662-667 (2005).
• 2. R.S. Dąbrowski, J.W. Dziaduszek, J. Kędzierski, and Z. Stolarz, “New nematic compounds and liquid crystalline mixtures with small ordinary refraction index”, Polish Patent no. PL 197552 B1 (2008).
• 3. J. Kędzierski, Z. Raszewski, M.A. Kojdecki, E. Kruszelnicki-Nowinowski, P. Perkowski, W. Piecek, E. Miszczyk, J. Zieliński, P. Morawiak, and K. Ogrodnik, “Determination of ordinary and extraordinary refractive indices of nematic liquid crystals by using wedge cells”, Opto-Electron. Rev. 8, 275-279 (2000).
• 4. K. Kowiorski, J. Kędzierski, Z. Raszewski, M.A. Kojdecki, J. Herman, E. Miszczyk, and W. Piecek, “Application of modified interference wedge method in measurements of indices of refraction and birefringence of nematic liquid crystals”, Acta Phys. Pol. A 124, 946-948 (2013).
• 5. A. Saupe and W. Maier, “Methoden zur Bestimmung des Ordnungsgrades nematischer kristallinflüssiger Schichten. Der Ordnungsgrad von Azoxyanisol”, Z. Naturforsch. A16, 816-824 (1961).
• 6. H.E.J. Neugebauer, “Clausius−Mosotti equation for certain types of anisotropic crystals”, Can. J. Phys. 32, 1-84 (1954).
• 7. S. Chandrasekhar and N.V. Madhusudana, “Orientational order in p-azoxyanisole, and their mixtures in the nematic phase”, Can. J. Phys. 30 C-4 Suppl. 11–12, 24-27 (1969).
• 8. M.F. Vuks, “Determination of optical anisotropy of aromatic molecules”, Opt. Spectrosc. 20, 361 (1966).
• 9. J. Kędzierski, Z. Raszewski, J. Rutkowska, W. Piecek, P. Perkowski, J. Żmija, R. Dąbrowski, and J.W. Baran, “On the consistency and applicability of internal field models in nematics”, Mol. Cryst. Liq. Cryst. 282, 205-222 (1996).
• 10. I. Haller, H.A. Huggins, H.R. Lilienthal, and T.R. McGuire, “Order-related properties of some nematic liquids”, J. Phys. Chem. 77, 950-954 (1973).
• 11. H.S. Subramhanyam, C.S. Prabha, and D. Krishnamurti, “Optical anisotropy of nematic compounds”, Mol. Cryst. Liq. Cryst. 28, 201-205 (1974).
• 12. W. Kuczyński, B. Żywucki, and J. Małecki, “Determination of orientational order parameter in various liquid crystalline phases”, Mol. Cryst. Liq. Cryst. 381, 1-19 (2002).
• 13. M. Olifierczuk, J. Kędzierski, Z. Raszewski, J. Zieliński, and E. Miszczyk, “The order parameter of liquid-crystalline mixture with dichroic dye for TN LCD”, Bull. Mil. Univ. Technol. XLVIII, 99-106 (1999).