Thermally managed Z-scan methods investigation of the size-dependent nonlinearity of graphene oxide in various solvents

Abstract

Thermally managed Z-scan using a modified chopper was compared to the utilization of a pulse picker with the common calibration material carbon disulfide and then extended to graphene oxide (GO) in different solvents at λ=800 nm. GO in distilled water using femtosecond laser excitation yielded a value of (−2.7±.4)×10−15 cm2/W for nanometer particles and (−1.6±.6)×10−15 cm2/W for micrometer-sized particles. Open-aperture Z-scan results using the modified chopper showed no experimental difference.