Enhanced Thermo-Optic Performance of Silicon Microring Resonators Integrated with 2D Graphene Oxide Films

The effective control of heat facilitated by advanced thermo-optic materials plays a crucial role in integrated photonic devices, providing key benefits for their functionality and stable operation. Here, we experimentally demonstrate the enhanced thermo-optic performance of silicon microring resonators (MRRs) by co-integrating them with two-dimensional (2D) graphene oxide (GO) films. Precise control over the GO films’ thicknesses and sizes is achieved, and we characterize thermo-optic response induced by both environmental temperature changes and coupled input light power for devices with GO films of different thicknesses and degrees of reduction. Experimental results show that the GO-coated MRRs exhibit greater wavelength shifts than the uncoated MRR as the environmental temperature rises, while devices with reduced GO (rGO) exhibit the opposite trend. On the other hand, we demonstrate enhanced optical bistability and optical nonreciprocal transmission (ONT) induced by coupled input light power in the hybrid MRRs. Our work opens up opportunities for implementing high-performance thermo-optic devices through the on-chip integration of 2D GO films.