Giant Broadband (450-2300 Nm) Optical Limiting And Enhancement Of The Nonlinear Optical Response Of Some Graphenes By Defect Engineering

The nonlinear optical response (NLO) of some boron (B-GO), nitrogen (N-GO) doped, B,N individually doped (B,N-GO), and B and N domain doped (BN-GO ) reduced graphene oxides (GO) is investigated under 4 ns, visible and infrared laser excitation. Besides their very large NLO response, it is shown that the B and/or N doping results in enhancement of the NLO response of undoped GO, the latter exhibiting weak response under visible excitation and negligible response under infrared excitation. In addition, the optical limiting (OL) action of B,N-GO and BN-GO was studied from 450 to 2300 nm and is compared to that of B-GO and N-GO, previously studied. Both B and N codoped graphenes exhibit very efficient broadband OL performance from visible to NIR, more efficient than that of B-GO and N-GO. Actually, the optical limiting onset of B,N-GO and BN-GO was found to attain record low values of 0.00096 and 0.00081 J cm(-2) toward NIR wavelengths, lower than any known graphene-based derivative. The current work demonstrates unambiguously the effectiveness of defect engineering of graphene to tailor and enhance the NLO response and optical power limiting action for several photonic and (opto)electronic applications.