Nonlinear optical properties of dye-doped E7 liquid crystals at the nematic–isotropic transition. Issue 2 (26th January 2016)

• Record Type: Journal Article
• Authors: Gómez, S.L.; Lenart, V.M.; Turchiello, R.F.; Bechtold, I.H.; Vieira, A.A.; Gallardo, H.
• Is Part Of: Liquid crystals. Volume 43:Issue 2(2016)
• Page Start: 268
• Page End: 275
• Publication Date: 2016-01-26
• Subjects: Dye -- phase transition -- Z-scan technique -- thermal lens -- nonlinear absorption -- nonlinear refraction; Liquid crystals -- Periodicals; 548.905
• DOI: 10.1080/02678292.2015.1105313
• Languages: English
• ISSNs: 0267-8292

Abstract

ABSTRACT: This work shows the influence of a 2, 1, 3-benzothiadiazole-based dye in the nonlinear optical refraction and nonlinear optical absorption of the thermotropic liquid crystal E7 at the nematic–isotropic transition in the ms time-scale using the Z-scan technique. The addition of dye does not modify the critical exponent of the nonlinear birefringence observed for the undoped sample at the transition, confirming the tricritical character. Also, the order parameter based in the nonlinear absorption shows, for the samples with higher dopings, a critical exponent that deviates from the expected value in the tricritical hypothesis. Graphical Abstract: