Saturable absorption and the changeover from saturable absorption to reverse saturable absorption of MoS₂ nanoflake array films

Abstract

MoS₂ nanoflake array films on different glass substrates were fabricated by an <italic>in situ</italic> growth method. The nonlinear absorption (NLA) properties of the MoS₂ nanoflake array films were investigated by an open-aperture Z-scan technique. The films exhibited different NLA properties dependent on the input energy.