Wang Wen, Wu Jieyun, Chen Kaixin, Huang Quandong, Luo Jingdong, Seng Chiang Kin
Opt Lett. 2020 Apr 15;45(8):2383-2386. doi: 10.1364/OL.390656.
We propose electric poling of electro-optic (EO) polymer films with graphene electrodes. The use of graphene electrodes can waive the use of buffer layers and minimize the poling voltage. To demonstrate the idea, we prepared EO polymer thin-film waveguides for poling with traditional Au/ITO electrodes and graphene electrodes, where the EO polymer is a guest-host system formed by doping 15 wt% of dipolar polyene chromophore AJLZ53 into the random copolymer P(S-co-MMA). Our experiments confirm that the use of graphene electrodes can significantly reduce the poling voltage. For a 3.8-µm-thick EO polymer film, we achieve high EO coefficients of 82 pm/V at 1541 nm and 110 pm/V at 1300 nm with a poling voltage of 420 V. In addition, the use of graphene electrodes allows more flexible waveguide designs and can potentially simplify the fabrication of devices based on EO polymer.
我们提出使用石墨烯电极对电光（EO）聚合物薄膜进行电场极化处理。使用石墨烯电极可以省去缓冲层的使用，并将极化电压降至最低。为了验证这一想法，我们制备了用于极化处理的EO聚合物薄膜波导，分别采用传统的金/氧化铟锡（Au/ITO）电极和石墨烯电极，其中EO聚合物是一种客体-主体体系，通过将15 wt%的偶极多烯发色团AJLZ53掺杂到无规共聚物P(S-co-MMA)中形成。我们的实验证实，使用石墨烯电极可以显著降低极化电压。对于厚度为3.8 µm的EO聚合物薄膜，在420 V的极化电压下，我们在1541 nm处实现了82 pm/V的高电光系数，在1300 nm处实现了110 pm/V的高电光系数。此外，使用石墨烯电极可以实现更灵活的波导设计，并有可能简化基于EO聚合物的器件制造。
