Shimizu Flávio M, Giacometti José A
Faculdade de Ciências e Tecnologia, Unesp, 19060-900 Presidente Prudente, São Paulo, Brazil.
Instituto de Física de São Carlos, USP, 13566-590 São Carlos, São Paulo, Brazil.
Rev Sci Instrum. 2016 Dec;87(12):123102. doi: 10.1063/1.4969057.
This work describes the experimental apparatus based on the Mach-Zehnder interferometer for measuring the electro-optic coefficient during and after the photo-assisted poling process using a continuous light excitation. We also show that the poling can be performed at cryogenic temperatures. The setup is based on the superposition of a Mach-Zehnder AC modulation voltage on the DC bias voltage required to promote the chromophore orientation during light excitation. The effect of the reversible polarization due to the DC bias voltage applied to the polymer film is considered to calculate the electro-optic coefficient during the photo-assisted poling process. The usefulness of our setup is demonstrated with three polymer films, with different electro-optic activities: guest-host, copolymer, and homopolymer, all based on methyl methacrylate monomers and containing disperse red-1 chromophores.
这项工作描述了一种基于马赫-曾德尔干涉仪的实验装置，用于在使用连续光激发的光辅助极化过程中及之后测量电光系数。我们还表明极化可以在低温下进行。该装置基于在光激发期间促进发色团取向所需的直流偏置电压上叠加马赫-曾德尔交流调制电压。考虑到施加到聚合物薄膜上的直流偏置电压引起的可逆极化效应，以计算光辅助极化过程中的电光系数。我们用三种具有不同电光活性的聚合物薄膜证明了该装置的实用性：客体-主体、共聚物和均聚物，它们均基于甲基丙烯酸甲酯单体并含有分散红-1发色团。
