Two-photon induced anisotropy in PMMA film doped with Disperse Red 13 |
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Authors: | CR Mendonça UM Neves L De Boni AA Andrade DS dos Santos Jr FJ Pavinatto SC Zilio L Misoguti ON Oliveira Jr |
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Institution: | Instituto de Física de São Carlos, Universidade de Sao Paulo, Caixa Postal 369, 13560-970 São Carlos, SP, Brazil |
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Abstract: | In this paper we present optical anisotropy induced by 150-fs laser pulses operating at 775 nm in poly(methyl methacrylate) (PMMA) films doped with Disperse Red 13 (DR13). Two-photon absorption of DR13 induces reversible birefringence in the sample, a feature associated with the molecular orientation caused by isomerization of the azochromophores. No irreversible anisotropy, associated with photobleaching of the chromophore was observed. The slope of 2 obtained for the induced birefringence as a function of the excitation irradiance corroborates the two-photon nature of the process. |
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Keywords: | Birefringence Azopolymers Two-photon absorption |
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