| Revista: | Brazilian journal of physics |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000397874 |
| ISSN: | 0103-9733 |
| Autores: | Gómez, S. L1 Lenart, V.M1 Bechtold, I.H2 Neto, A.M. Figueiredo3 |
| Instituciones: | 1Universidade Estadual de Ponta Grossa, Departamento de Fisica, Ponta Grossa, Parana. Brasil 2Universidade Federal de Santa Catarina, Departamento de Fisica, Florianopolis, Santa Catarina. Brasil 3Universidade de Sao Paulo, Instituto de Fisica, Sao Paulo. Brasil |
| Año: | 2012 |
| Periodo: | Dic |
| Volumen: | 42 |
| Número: | 5-6 |
| Paginación: | 355-359 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Analítico |
| Resumen en inglés | We present an experimental study of the nonlinear optical absorption of the eutectic mixture E7 at the nematic–isotropic phase transition by the Z-scan technique, under continuous-wave excitation at 532 nm. In the nematic region, the effective nonlinear optical coefficient β, which vanishes in the isotropic phase, is negative for the extraordinary beam and positive for an ordinary beam. The parameter SNL, whose definition in terms of the nonlinear absorption coefficient follows the definition of the optical-order parameter in terms of the linear dichroic ratio, behaves like an order parameter with critical exponent 0.22 ± 0.05, in good agreement with the tricritical hypothesis for the nematic– isotropic transition |
| Disciplinas: | Física y astronomía |
| Palabras clave: | Física de materia condensada, Optica, Absorción óptica, Cristales líquidos, Optica no lineal |
| Keyword: | Physics and astronomy, Condensed matter physics, Optics, Optical absorption, Liquid crystals, Nonlinear optics |
| Texto completo: | Texto completo (Ver PDF) |
