Saturable Absorption of Nonlinear Graphene Coated Si 3 N 4 Waveguides

We investigate the saturable absorption of hybrid graphene/ silicon-nitride waveguides at telecom wavelengths. By measuring the power dependent transmission of picosecond and sub-picosecond pulses, we clarify the temporal dynamics of photo-excited carriers in graphene. © 2019 The Author(s)