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Published on: October 31, 2019
Temperature dependence of the refractive index near the reentrant-isotropic--calamitic-nematic phase transition
J R Pereira1, A M Mansanares, A J Palangana
1Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas, Unicamp, Caixa Postal 6165, 13083-970, Campinas, São Paulo, Brazil.
Abstract:
The laser-induced nonlinear optical response of a lyotropic liquid crystal system in the reentrant-isotropic and calamitic-nematic phases is investigated by the use of the thermal lens technique. The occurrence of an inversion in the temperature coefficient of the ordinary refractive index, dn(radially)/dT, near the reentrant-isotropic-calamitic-nematic phase transition, is discussed. This effect is attributed to the behavior of the electronic polarizability due to the change in micelle shape near the isotropic-nematic transition, and correlated with the results obtained near the nematic-isotropic transition, previously reported.
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