Large nonlocal nonlinear optical response of castor oil |
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Authors: | Rog rio F. Souza, M rcio A.R.C. Alencar, Mario R. Meneghetti,Jandir M. Hickmann |
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Affiliation: | aDepartamento de Eletrônica, Centro Federal de Educação Tecnológica de Alagoas, 57000-000 Maceió, AL, Brazil;bOptics and Materials Group – OPTMA, Instituto de Física, Universidade Federal de Alagoas, Caixa Postal 2051, 57061-970 Maceió, AL, Brazil;cInstituto de Química e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceió, AL, Brazil |
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Abstract: | The nonlocal nonlinearity of castor oil was investigated using the Z-scan technique in the CW regime at 514 nm and in femtosecond regime at 810 nm. Large negative nonlinear refractive indexes of thermal origin, thermo-optical coefficients and degree of nonlocality were obtained for both laser excitation wavelengths. The results indicate that the electronic part of the nonlinear refractive index and nonlinear absorption were negligible. Our results suggest that castor oil is promising candidate as a nonlinear medium for several nonlocal optical applications, such as in spatial soliton propagation, as well as a dispersant agent in the measurement of absorptive properties of nanoparticles. |
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Keywords: | Nonlocal nonlinearity Thermo-optical effect Castor oil Optical properties |
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