| Autor: |
Iteb, Loubiri, Sanaâ, Fadhel, Gharbia, Mohamed |
| Předmět: |
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| Zdroj: |
Molecular Crystals & Liquid Crystals; 2017, Vol. 648 Issue 1, p22-28, 7p |
| Abstrakt: |
In this work, we explore the refractive index of the phasmidic columnar liquid crystal for homeotropic oriented samples (column perpendicular to the plates). To measure the ordinary index noof the columnar liquid crystal C10, a simple and accurate method is presented using the deflection by reflection of a laser beam (λ = 633nm) through a prismatic phasmidic thin film placed between two glass plates in the homeotropic orientation. For the C10samples, we found no= 1.5512 ± 0.0002 at T = 100°C. We used the same method to determine the isotropic index nlof the isotropic phase and found nl= 1.5301 ± 0.0002 at T = 120°C. Using the precision of the same method in polychromatic laser beam, we measured the variation of the ordinary index with the wavelength λ and characterize the dispersion by the known Cauchy's dispersion relationship no= A + B/λ2. We deduce an estimation of the birefringence for several samples. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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