Photo-thermal tuning of graphene oxide coated integrated optical waveguides

The power-sensitive photo-thermal tuning (PTT) of two-dimensional (2D) graphene oxide (GO) integrated on the top surface of silicon nitride (SiN) waveguides is experimentally investigated. For SiN waveguide coating with monolayer GO, the light power thresholds for reversible and permanent GO reduction are measured. There are three reduction stages identified based on the presence of reversible versus permanent reduction. We also compared the PTT induced by a continuous-wave laser and a pulsed laser with the same average power, confirming that the PTT is primarily determined by the average input power.

Automated summary

The power-sensitive photo-thermal tuning (PTT) behavior of graphene oxide (GO) integrated on the top surface of silicon nitride (SiN) waveguides is experimentally investigated. The thresholds for reversible and permanent GO reduction are measured for SiN waveguide coating with monolayer GO. Three reduction stages are identified based on the reversibility of the reduction process. The study confirms that the PTT is primarily determined by the average input power, regardless of the type of laser used.