用于电光聚合物/二氧化钛垂直槽波导调制器高效极化的溶胶-凝胶二氧化硅包层的增强导电性

Enhanced conductivity of sol-gel silica cladding for efficient poling in electro-optic polymer/TiO2 vertical slot waveguide modulators.

作者信息

Enami Yasufumi, Jouane Youssef, Luo Jingdong, Jen Alex K-Y

出版信息

Opt Express. 2014 Dec 1;22(24):30191-9. doi: 10.1364/OE.22.030191.

DOI:10.1364/OE.22.030191

Abstract

We report the enhanced conductivity of sol-gel silica under-cladding for efficient poling of electro-optic (EO) polymer in a hybrid EO polymer/TiO2 vertical slot waveguide modulator. The electrical volume conductivity of sol-gel silica cladding increases approximately 30 times when the calcining time of the cladding layer is critically reduced to 45 minutes, which increases the in-device EO coefficient of the 600-nm-thick EO polymer film in modulators and reduces the lower halfwave voltage (Vπ) of the modulators. The lowest driving voltage (Vπ) of the TiO2 slot waveguide modulator is 2.0 V for an electrode length (Le) of 10 mm and wavelength of 1550 nm (VπLe = 2.0 V·cm) for the low-index guest-host EO polymer SEO125. The optical propagation loss is reduced to 7 dB/cm.

摘要

我们报道了在混合电光（EO）聚合物/TiO₂垂直槽波导调制器中，用于高效极化电光聚合物的溶胶-凝胶二氧化硅包层的电导率增强。当包层的煅烧时间严格减少到45分钟时，溶胶-凝胶二氧化硅包层的电导率增加约30倍，这增加了调制器中600纳米厚的电光聚合物薄膜的器件内EO系数，并降低了调制器的下半波电压（Vπ）。对于低折射率客体-主体电光聚合物SEO125，当电极长度（Le）为10毫米且波长为1550纳米时，TiO₂槽波导调制器的最低驱动电压（Vπ）为2.0伏（VπLe = 2.0 V·cm）。光传播损耗降低到7 dB/cm。