Nonresonant third-order susceptibility measurements in the nematic liquid crystal K18

✍ Scribed by John Philip; T. A. Prasada Rao

• Book ID: 104768922
• Publisher: Springer
• Year: 1993
• Tongue: English
• Weight: 260 KB
• Volume: 25
• Category: Article
• ISSN: 0306-8919
• DOI: 10.1007/bf00420760

✦ Synopsis

We have observed a large nonresonant third-order nonlinear susceptibility, X(3) (-w; ~, 0, 0) in the isotropic phase of a nematic liquid crystal 4t-n-hexyl-4cyanobiphenyl (K18). The highest value of X (3) obtained at 632.8nm is 1.16274x10-18m2V -2 corresponding to a temperature 29.3~

The observed second-order pretransitional temperature T* from our measurements is 1.2~ below the first-order nematic to isotropic.transition temperature. The dependence of the Kerr constant on (T -T*) -1 is found to be in good agreement with the predictions of the Landau-de Gennes model.