Measurement of refractive-index change at a liquid–solid interface close to the critical angle
M. MartinelliLaboratório de Optica Quântica, Instituto de Física da Universidade de São Paulo, PO Box 66318, São Paulo 05389-970, Brazil. [email protected]Marcos GugliottiM. Martinelli ([email protected]) and R. J. Horowicz are with the Laboratório de Óptica Quântica, Instituto de Física da Universidade de São Paulo, P.O. Box 66318, São Paulo 05389-970, Brazil.M. Gugliotti is with the Departamento de Bioquímica, Instituto de Química da Universidade de São Paulo, P.O. Box 26077, São Paulo 05508-970, BrazilR. J. HorowiczM. Martinelli ([email protected]) and R. J. Horowicz are with the Laboratório de Óptica Quântica, Instituto de Física da Universidade de São Paulo, P.O. Box 66318, São Paulo 05389-970, Brazil.M. Gugliotti is with the Departamento de Bioquímica, Instituto de Química da Universidade de São Paulo, P.O. Box 26077, São Paulo 05508-970, Brazil
2000en
ABI
Аннотация
We measured the refractive-index change on a liquid sample, using the reflection of a polarized Gaussian laser beam close to the angle of total reflection. We applied this technique to a solution of nickel (ii) phthalocyanine tetrasulfonated (NiPTS) in water-ethanol (1/1 v/v), in which the nonlinearity of the refractive index is due to optically induced thermal effects. We show that close to the angle of total reflection the sensitivity of this technique is four times bigger than at normal incidence.
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