Improved attenuated-total-reflection technique for measuring the electro-optic coefficients of nonlinear optical polymers
Improved attenuated-total-reflection technique for measuring the electro-optic coefficients of nonlinear optical polymers
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DOI：
10.1364/josab.17.000805
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发表时间：
2000-05
影响因子：
1.9
通讯作者：
Yi Jiang;Z. Cao;Q. Shen;X. Dou;Yingli Chen;Y. Ozaki
中科院分区：
文献类型：
--
作者：
Yi Jiang;Z. Cao;Q. Shen;X. Dou;Yingli Chen;Y. Ozaki
介绍了一种测量非线性光学聚合物电光系数的新技术。在衰减全反射实验中，极化聚合物的折射率由于普克尔斯效应而改变。这种变化导致表面等离子体激元模式的角位置的偏移，其对应于固定角度处的反射率的变化。通过测量在适当选择的角度下光反射率的变化，可以计算极化聚合物的电光系数。与其他传统方法相比，这里的电光系数以更简单的形式给出，所需参数更容易测量。不需要常用的锁定放大器。该技术是一种用于测量电光系数的高灵敏度方法，因为新选择的工作内角使得折射率的微小变化导致反射率的大变化。
A new technique for measuring the electro-optic coefficient of nonlinear optical polymer is described. In an attenuated-total-reflection experiment the refractive index of the poled polymer is changed because of the Pockels effect. This change causes a shift of the angular position of the surface plasmon modes that corresponds to a change in reflectivity at a fixed angle. By measuring the change of the light reflectivity at the properly chosen angle one can calculate the electro-optic coefficient of the poled polymer. Compared with other, conventional methods, here the electro-optic coefficients are given in a simpler form and the required parameters are easier to measure. The commonly used lock-in amplifier is not required. This technique is a highly sensitive method for measuring the electro-optic coefficient because of the newly chosen working interior angle for which a tiny change in the refractive index leads to a large change in reflectivity.