Defect assisted optical limiting performance of hexagonal boron nitride nanosheets in aqueous suspension and PMMA nanocomposite films

Defect-assisted nonlinear absorption (NLA) and optical limiting (OL) performance of hexagonal boron nitride nanosheets (h-BNNS) in aqueous suspension polymethyl methacrylate matrix (PMMA) as nanocomposite films were studied using open-aperture Z-scan method. To evaluate the transmission data, a theoretical model accounting one photon (OPA), two (TPA), free carrier (FCA) saturation each process was considered. NLA coefficients intensity thresholds extracted from fitting experimental results for 532 1064 nm pulse wavelengths. Strong defect-assisted response h-BNNS observed while at considerably stronger. This is attributed to excitation greater number defect states over wider energy range. Our findings showed that h-BNNS/PMMA feature highly required properties OL applications can function wide spectral range (?200–1064 nm).