Non-linear electrooptic effect in antiferroelectric liquid crystal

• Autorzy: Dardas D. , Kuczyński W. , Hoffmann J. , Jeżewski W. , Nowicka K. K. , Małecki J.
• Języki publikacji: EN

Abstrakty

EN

Electrooptic phenomena caused by weak electric fields, much lower than those needed for the helix unwinding, in helical smectic liquid crystals were studied in thin planar samples. The investigations were performed in chiral liquid crystal 4-(1-methyl-heptyloxycarbonyl) phenyl 4'-(3-butanoyloxy propyl-1-oxy) biphenyl-4-carboxylate which exhibits antiferro-electric properties. We have found that electric field applied to a helical smectic liquid crystal caused two effects. First, the helix was deformed and the position of effective optic axis changed by an angle proportional to the field strength. The second effect, quadratic in field, causes the change in the shape of the indicatrix. As a consequence, the relative changes in the light intensity caused by external electric field consist of two components. The first component represents the modulation with the fundamental frequency and the second one with the doubled frequency (second harmonic of the electrooptic effect). The ab- solute values of the first- and second-order electrooptic coefficients have been determined and their temperature dependence discussed.

Słowa kluczowe

EN

non-linear effect; antiferroelectric liquid crystals; smectics; electrooptics

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2009
• Tom: Vol. 17, No. 1
• Strony: 25--29
• Opis fizyczny: Bibliogr. 8 poz.

Twórcy

autor

Dardas D.

autor

Kuczyński W.

autor

Hoffmann J.

autor

Jeżewski W.

autor

Nowicka K. K.

autor

Małecki J.

• Institute of Molecular Physics, Polish Academy of Sciences, 17 Smoluchowskiego Str., 60-179 Poznań, Poland,

Bibliografia

• [1] S.T. Lagerwall, Ferroelectric and Antiferroelctric Liquid Crystals, Wiley-VCH, Weinheim, 1999.
• [2] W. Kuczyński: Electrooptical studies of relaxation processes in chiral smectic liquid crystals. Relaxation Phenomena, pp. 422-444, edited by W. Haase and S. Wróbel, Springer-Verlag, Berlin Heidelberg, 2003.
• [3] A. Mikułko, M. Marzec, S. Wróbel, and R. Dąbrowski: Electrooptic study of antiferroelectric mixtures for display application. Opto-Electron. Rev. 14, 319-322, 2006.
• [4] D. Dardas, W. Kuczyński, and J. Hoffmann: Measurements of absolute values of electrooptic coefficients in a ferroelectric liquid crystal. Phase Transit. 79, 213-222, 2006.
• [5] H. Orihara and Y. Ishibashi: Electro-optic effect and third-order nonlinear dielectric response in antiferroelectric liquid crystals. J. Phys. Soc. Jpn. 64, 3775, 1995.
• [6] W. Kuczyński, D. Dardas, F. Goc, and R. Dąbrowski: Linear and quadratic electrooptic effects in antiferroelectric liquid crystals. Ferroelectrics 274, 191-199, 2000.
• [7] D. Dardas and W. Kuczyński: Non-linear electrooptical effects in chiral liquid crystals. Opto-Electron. Rev. 12, 277-280, 2004.
• [8] W. Jeżewski, W. Kuczyński, J. Hoffmann, and D. Dardas: Comparison of dielectric and optical response of chevron ferroelectric liquid crystals. Opto-Electron. Rev. 16, 281-286, 2008.