Chang Zeshan, Jin Wei, Chiang Kin Seng
Opt Lett. 2018 Apr 15;43(8):1718-1721. doi: 10.1364/OL.43.001718.
We propose and demonstrate the use of graphene electrodes for lithium-niobate electro-optic (EO) devices to exempt the need of incorporating a buffer layer between the waveguide and the electrodes. Using graphene electrodes, our experimental mode converter, based on an EO-generated long-period grating in a LiNbO waveguide, shows a reduction in the half-π voltage by almost three times, compared with the conventional electrode design using metal. With the buffer layer exempted, the device fabrication process is also significantly simplified. The use of graphene electrodes is an effective approach to enhancing the efficiency of EO devices and, at the same time, reducing their fabrication cost.
我们提出并演示了将石墨烯电极用于铌酸锂电光（EO）器件，从而无需在波导和电极之间加入缓冲层。使用石墨烯电极，我们基于铌酸锂波导中电光产生的长周期光栅制作的实验性模式转换器，与使用金属的传统电极设计相比，其半波电压降低了近三倍。由于无需缓冲层，器件制造工艺也得到了显著简化。使用石墨烯电极是提高电光器件效率并同时降低其制造成本的有效方法。
