High-Q titanium dioxide micro-ring resonators for integrated nonlinear photonics
Meicheng Fu, Yi Zheng, Gaoyuan Li, Hao Hu, Minhao Pu, Leif Katsuo Oxenløwe, Lars H. Frandsen, Xiujian Li, Xiaowei Guan
Abstract
We report on the nonlinear characterizations of the titanium dioxide micro-ring resonators (TiO 2 MRRs). By utilizing optimized fabrication processes, high quality factors (Q∼1.4 × 10 5 ) doubling that of the previous work are achieved here for TiO 2 MRRs with high-confinement TiO 2 waveguides. The four-wave mixing (FWM) experiment results with low and high signal power demonstrate that, the fabricated TiO 2 MRRs can perform broadband (∼40 nm) wavelength conversion and cascaded FWMs. These achievements pave the way for key nonlinear photonic applications with TiO 2 waveguides and provide an efficient platform for various integrated photonic devices.