Qu Yang, Yang Yunyi, Wu Jiayang, Zhang Yuning, Jia Linnan, El Dirani Houssein, Crochemore Romain, Sciancalepore Corrado, Demongodin Pierre, Grillet Christian, Monat Christelle, Jia Baohua, Moss David J
Optical Sciences Center, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.
Center for Translational Atomaterials, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.
Micromachines (Basel). 2022 Jul 28;13(8):1194. doi: 10.3390/mi13081194.
We experimentally investigate power-sensitive photo-thermal tuning (PTT) of two-dimensional (2D) graphene oxide (GO) films coated on integrated optical waveguides. We measure the light power thresholds for reversible and permanent GO reduction in silicon nitride (SiN) waveguides integrated with one and two layers of GO. For the device with one layer of GO, the power threshold for reversible and permanent GO reduction are ~20 and ~22 dBm, respectively. For the device with two layers of GO, the corresponding results are ~13 and ~18 dBm, respectively. Raman spectra at different positions of a hybrid waveguide with permanently reduced GO are characterized, verifying the inhomogeneous GO reduction along the direction of light propagation through the waveguide. The differences between the PTT induced by a continuous-wave laser and a pulsed laser are also compared, confirming that the PTT mainly depend on the average input power. These results reveal interesting features for 2D GO films coated on integrated optical waveguides, which are of fundamental importance for the control and engineering of GO's properties in hybrid integrated photonic devices.
我们通过实验研究了涂覆在集成光波导上的二维氧化石墨烯（GO）薄膜的功率敏感光热调谐（PTT）。我们测量了与一层和两层GO集成的氮化硅（SiN）波导中GO可逆和永久还原的光功率阈值。对于具有一层GO的器件，GO可逆和永久还原的功率阈值分别约为20和22 dBm。对于具有两层GO的器件，相应的结果分别约为13和18 dBm。对具有永久还原GO的混合波导不同位置的拉曼光谱进行了表征，证实了GO沿光波导传播方向的还原不均匀性。还比较了连续波激光和脉冲激光诱导的PTT之间的差异，证实PTT主要取决于平均输入功率。这些结果揭示了涂覆在集成光波导上的二维GO薄膜的有趣特性，这对于混合集成光子器件中GO特性的控制和工程具有至关重要的意义。
