On-chip electro-optic tuning of a lithium niobate microresonator with   integrated in-plane microelectrodes
  We demonstrate electro-optic tuning of an on-chip lithium niobate microresonator with integrated in-plane microelectrodes. First two metallic microelectrodes on the substrate were formed via femtosecond laser process. Then a high-Q lithium niobate microresonator located between the microelectrodes was fabricated by femtosecond laser direct writing accompanied by focused ion beam milling. Due to the efficient structure designing, high electro-optical tuning coefficient of 3.41 pm/V was observed. 
Min Wang, Yingxin Xu, Zhiwei Fang, Yang Liao, Peng Wang, Wei CHu,   Lingling Qiao, Jintian Lin, Wei Fang, and Ya Cheng
physics.optics